Instead of spamming the discussion page with comments on the lack of activity (which it's never been exactly busy), you could try starting an actual discussion related to XCOM.
I play on the Xbox One and I know I originally thought the General was in black armor but I think it turned out to just be the lighting for that mission shading the green a darker hue; I haven't seen any in orange.
While Firaxis did put a few Easter Egg nods to the game in the Enemy Within expansion, they haven't made any statement in regard to The Bureau's continuity with their games.
Both are great games but I would say XCOM 2 is a big improvement on XCOM: Enemy Unknown in almost every way.
Chryssalids can be quite dangerous if not dealt with quickly and certainly if they get a chance to start turning soldiers/civilians into Zombies. Mutons and Cyberdiscs when they first show up can be tend to be extremely tough especially as they are quick to punish any soldier grouping with a grenade. On the higher difficulties, Thin Men and Outsiders can be brutal during the early game when one good shot can be instant death for your low health units.
I like your I idea and I've dropped you a message on your Message Wall if you want to pursue this further.
By all means, start contributing to the wiki.
Some or most of it can be added to the XCOM Archives info on the Commander's Quarters page.
Where are you seeing/hearing the phrase "reactivation"? The opening cinematic to XCOM EU has the Council chairman speak of the Council nations approving the "activation of the XCOM Project".
The XCOM titles put out by 2K have no official connections to the timelines/events of the previous games. XCOM EU serves as a reboot of the series; it, EW and XCOM 2 all essentially exist in their own timelines. The events of the Bureau have never been officially confirmed to be connect with the games by Firaxis either and likely exist in their own alternate timeline as well.
While it's certainly possible false assumptions may have resulted in bad information, another possibility is a game patch may have fixed or changed some the ability/environment interactions from when the information was originally entered on the wiki (as I believe may be the case with the Berserker while burning). In general, asking here or drop a query on the related talk page for confirmation is a good way to go; if you don't think you're encountering a bug and you've observed multiple circumstances of such interactions please feel free to update the wiki (but don't forget to note the correction in the edit description).
While the Long War 2 mod is certainly endorsed by Firaxis (the developer), it is still a mod and not an officially published product by 2K; so currently Long War content doesn't belong on the wiki.
Mods are not currently available for the console versions of the game; statements by Firaxis made prior to the console launch indicated mod availability wasn't a feature they were actively pursuing to include.
You mean the XCOM Hero unit? Just rename a soldier with Peter as the first name and Van Doorn as the last name; this will unlock a super strong Assault Ranger character. Just remember, activating any hero will disable achievements.
*Keep the mission objectives in mind and watch those mission timers; most missions in XCOM 2 have turn limits so its important to keep advancing towards your goal. You don't want to blindly rush in and find your squad surrounded by enemies but creeping too slow can risk costing you the mission or being forced to leave someone behind come evac time.
*Use concealment to set up quick ambushes as that what the developers have said is the main purpose of the mechanic. Trying to "stealth" all the way to an objective is typically either going to take too long (see point above) or bring every enemy crashing down on you at once when you do have to break concealment.
*Be aware of your environment. Running through fire or acid will damage your soldiers and cars that catch fire will explode the next turn so make sure to get clear. Rooftops (and intermediate levels) can be destroyed by fire or explosives which will result in additional damage for any unit that falls through to the floor below.
*Missions pop up frequently and soldiers that get hurt during battle can be out of action for pretty lengthy periods of time; make sure your soldier roster has some depth so you always have a team able to deploy. Otherwise building the Advanced War Center can help reduce injury recovery times.
*Watch out for seriously wounded soldiers receiving the SHAKEN status; it reduces their Will to 0 (making them more prone to panic and susceptible to psychic attacks) until removed which can only be done by having the soldier participate in a successful mission where they kill an enemy AND take no damage.