People are reading a bit too much into this loss. It is a big deal that someone was able to beat Magnus Carlsen at any time control, especially in this era where Magnus has seemingly reached a new level of chess skill, but bullet is by far the the easiest for a champion to make a mistake or series of them. Magnus is ridiculously strong at bullet but I’ve watched his live-streams and sometimes he blunders really badly, that’s just part of bullet. Although he is incredibly strong at bullet, probably 50-100 points higher than the world #2. Anyone not a high ranked GM wouldn’t stand a chance of beating him in a series of more than 5 games. But I’ve seen him lose to players he is obviously better than. He’s the #1 so they try their hardest. Nothing comes easily for Magnus.