@[email protected] extremely complicated. it depends entirely on how well federated your old account was. how many of those instances you interacted with are still online 2 years later. as for the second question? it also depends. certain instances reject DELETE activities (this is intentional, often used maliciously) and so it's hard to say how long they may stay in other instances. it depends on how your instance handles deletes of posts too. certain software likes to fire off delete activities all at once to every instance (and those instances may be offline and unable to receive them... so many things)
@raphaelmorgan for what it’s worth he also deadnamed and misgendered a certain fedi main character everyone is supposed to hate. Which is impressive, because he had to actively look it up, this wasn’t any accident. Besides the threatening murder.