There's a distinction I make (and some writers to favor when they can) between the stories actually printed in real comics during the Golden Age, and all the fiddling and retcons and rewriting history that's been done since then. Maybe this is a tribute and farewell to the Young Allies who appeared during WW II, leaving out the characters created thirty or forty years later and retroactively claimed to have been around back then.
Publishers and creators can wipe out and rebuild universes all they like, that's their privilege. But as long as the actual issues of MARVEL MYSTERY COMICS and ALL-STAR COMICS and THE MARVEL FAMILY survive, those characters and their stories still exist. There may be new versions refashioned for modern readers, but the originals are beyond being harmed. That's how I feel, anyway.