Player is marked as "Clean":

http://battlelog.battlefield.com/bf4/soldier/Multicentral/stats/1819195796/pc/

http://bf4db.com/player/1819195796

Seems like his account had a FairFight stats reset:

http://prnt.sc/nt4qfi

http://bf4cheatreport.com/?pid=1819195796&uid=&cnt=40&startdate=201811200156

Does not seem like a reset, rather a bug or a game where the score did not get saved resulting in the game after showing a different rank.

Kills are there, deaths also, shots fired, shots hit, best weapon kills too, weird.