According to this page - https://www.chess.com/livechess/players?type=Bullet , he's currently the 3rd best bullet player in this site. Actually the 2nd best if he's actually Carlsen.
Is this Magnus Carlsen?

Several has told me GM Magnus the #1 is himself. Can he have 2 accounts?
Titled players are allowed to use two accounts.

Many Scandinavian people told me that Magnus has a ghost account..
What's a ghost account?

His username is stoptryinghard, now we all know that Carlsen's username in ICC is stoptryharding.
Yes, because we all knew that...
Now, question: Why do you care?

His username is stoptryinghard, now we all know that Carlsen's username in ICC is stoptryharding.
Yes, because we all knew that...
Now, question: Why do you care?
Are you a troll?

Do you think that I'm a troll because I questioned the importance of knowing if a certain account belongs to MC or because I said that I didn't know his ICC handle?
That's a somewhat rhetorical question, since in either case I think that you're pretty delusional.

Do you think that I'm a troll because I questioned the importance of knowing if a certain account belongs to MC or because I said that I didn't know his ICC handle?
That's a somewhat rhetorical question, since in either case I think that you're pretty delusional.
You don't have to say anything anymore. You have succesfully made it into my block list.

So here's a guy who currently has a bullet rating of 3003, this rating is still rising at a pretty good pace. His username is stoptryinghard, now we all know that Carlsen's username in ICC is stoptryharding.
So, is this actually Magnus Carlsen who's playing here? He has played over 1000 bullet games, so allegations of cheating can be ruled out.
The account appeared soon after Magnus joined chess.com with his official name. Very similar name to his ICC handle. Norway flag in the profile. And, in short amount of time, he's risen to 3000+, passing all the other strong bullet players on this site—and now closing in on Hikaru.
Seems like it's Magnus' second account, to me! If it weren't, I'd be very surprised.
Either way, I'd love to see a match between the herculean Hikaru and the sky-rocketing StopTryingHard!

His username is stoptryinghard, now we all know that Carlsen's username in ICC is stoptryharding.
If that's the case, then I'm inclined to believe that this guy isn't Carlsen. It seems like he's trying too hard to imitate Carlsen, with the username and the Norwegian flag. If it were Carlsen himself, I imagine that he wouldn't want it to be so obvious.
So here's a guy who currently has a bullet rating of 3003, this rating is still rising at a pretty good pace. His username is stoptryinghard, now we all know that Carlsen's username in ICC is stoptryharding.
So, is this actually Magnus Carlsen who's playing here? He has played over 1000 bullet games, so allegations of cheating can be ruled out.