Its not even called Suicide Squad 2, which has to be on purpose, and has really no similarities outside of sharing some cast members. They might specifically mention events of the first movie, but its no more a snyderverse film then Shazam or Aquaman are/their sequels will be. The Flash film is already apparently killing off that universe anyway, so any potential third Suicide Squad film will almost certainly expressley be non-canon with Snyder's stuff. Hell, WW84, for as bad as it was, went pretty against the Snyder films anyway.
The Suicide Squad is really its own thing at this point. I doubt anyone at WB is even bothering to pretend Mos/BvS/JL matter at all in the context of this film. Even if any of those get referenced, it will probably be vague enough to ignore or work in another context. I'd bet on Harley Quinn's film getting referenced, some of the events of the first Suicide Squad getting mentioned, but any potential Superman/Batman type references being things that could work even while ignoring the Snyder stuff.
WB has already said the snyder stuff was done after the Snydercut, and the Snydercut isn't even canon to the DCEU stuff that got released anyway. Its over, Snyder and his stuff are gone and WB is moving on, keeping the non-Snyder stuff that worked and starting over with other things.