From Halopedia, the Halo wiki
June 11, 2018
Edited the page Banished
Edited the page Battle for Zeta Halo
Edited the page Battle for Zeta Halo
Edited the page Battle for Zeta Halo
Edited the page Swords of Sanghelios
Done. However, it's much more time-efficient if you can add proper sources yourself, as you did with the source for Kelly's EVA armor. Check Template:Ref for further guidance on how to do citations. Also, don't hesitate to ask any of the staff if you have questions!
In general, it's something we're strict on especially after the leak situation with the main game as a whole. It's now in the store, so it's fine now though.
Hey- when adding new info to articles please remember to add sources. See here for a guide. Thanks.
That's fair, and not an unreasonable line of logic. In general though, multiplayer is canon in the sense that a rough backdrop is the SPARTAN-IVs in WarGames - but specific game mechanics are typically not representative of any specific lore.
This would likely be easier to do in Discord, but as a general rule, the Armour Core system we see in Halo Infinite is only an abstraction for gameplay purposes. In-universe, there's likely nothing specifically stopping a GEN3-enhanced Scout helmet from being used with Mark VII components. Mark VII is only a specific suit.
As for the Argus and whatnot, I'd be hesitant to say anything beyond them being GEN3 armours until we get more confirmed information on them. Best not to make assumptions, in general.