I'd even forgotten about it, but then I saw this post and fell into an endless spiral again. Like, it's obvious that He Who Remains would erase everyone's memory to try to prevent the damage that Loki's presence in the past could cause, but Mobius clearly hasn't forgotten. He might not remember the past TVA but something must have been in the back of his mind about that handsome guy who appeared out of nowhere completely desperate saying he knew him, probably an itch that led him to try to find out what it could be and that ended up leading him to that variant of the God of Mischief. That's probably why he ended up studying everything about that guy who was painfully familiar to him and waited for the moment where he would appear again. And holy shit Mobius, you really waited for so long 😭