Ratimov could argue he changed his username for privacy reasons. Lol.
I think someone more familiar said here that Ratimov is his last name in real life. From that point of view, this change is completely understandable. He probably should have done it earlier, this way it looks like the drop in ratings initiated the change.
I'm jealous lol! It's been 6 months since I asked to change my username to the admins!

Sometimes it takes
a very tong time, but just hang in there and
don't give up. Help me count. How many months were those, minus the time he waited after sending PMs?

If I remember correctly, The Cryptovator changed his username twice in a short period. Still, theymos has proven that he follows events on the forum, although it does not participate in most of the discussions.