I know for a fact with all factors being equal there is no way a single person has played over 1,000 games in 6 days. I hear people share accounts, and if it’s true is it not against any terms or conditions for the tournament.
And also how sweaty can one person be to lose only 91 out of 635 matches, looking across all the leader boards it’s kinda suspicious to have such a low loss rate about 17% which way below what will be considered below average.