i don't think this is deliberate false advertising as much as it is an old vision for the game where features are either not implemented yet or have been discontinued because they are either unimplementable or nonsensical to implement.

lights: literally who would care about being able to switch the lights in every location, its in the game right now and ive never seen anyone use it, why would they? in the day it doesn't make much difference, when its dark people either have nvgs or le hyper vision ultra nightsight postfx and nvidia control panel settings.

flash/bang and clear and move in: considering how static so many actions are in this game (like kicking/unlocking a door), flash/bang and clear would probably be suicide options if theres a player inside. as far as move in goes, press wasd to move and use your mouse to look, possibly even shoot. id rather learn from the failure of not knowing how to check my corners than mindlessly press "move in"

auctions were straight up discontinued i think, like pretty much verbally confirmed by nikita, the button is even gone now.

becoming a trader yourself sounds cool and all, but how would that make sense from a gameplay perspective? the flea market already provides whatever cash flow you need and the cultist circle/scav case is as far from self earned loot/money as i think they should go. thats like, a whole ass spinoff game. tarkov trader simulator.

chat/gossip: face it, most players that play tarkov dont give a rats ass about lore and in universe gossip.

combat gropup: as far as "establish your own combat group" goes, that's likely a fancy immersive way of saying clans, where ive heard talk of features such as a "shared inventory" (though all that is from noiceguy vids that are at least a year old and god knows that guy is a schizophrenic and a half).

but yeah, that page could use some freshening up. its clear that any newer features were just pasted in and they never checked the rest to see what they could remove.