Sudden improvement , cheating? teaming up with accounts with terrible stats on purpose for easy lobbies or what else can be ?

I see many players that previous seasons had like 10 percent winning rate and suddenly they get 70 or 80 percent winning percentage this season like this https://fortnitetracker.com/profile/all/KinGLebroN11 ( leader in solo wins this season ) for example 89 percent winning rate in solos and some seasons he had like 4 winning percentage. I understand in duos and trios and squads someone who is experienced can just team up on purpose with profiles with terrible stats so they get to easy lobbies so they get easier wins but in solos how ? Of course i believe that players can improve but a so sudden improve in some players that from 10 percent they get suddenly 90 percent winning rate its kind of weird and suspicious . what is your thoughts ? Also i believe maybe some of them give their accounts to experienced players to boost their stats and they pay them for this there are many services like this online.

P.s i am not talking only for this person it was just a random example , i just see these weird stats to many players.