I doubt anyone would see the old posts after they’re edited. The second point makes sense I guess.

Yes, the ones you mentioned. At least these accounts and threads are not always deleted. It’s happened before on lemmy that multiple posts get made on the same topic by new accounts and then both the post and account get deleted. I remember similar around last year so it’s not new.

What I don’t get is why. This time some of the posts are actually interesting and generate discussions but the OP never interacts with any comments. What do they gain from this?