What would Kim Seong-hyeon's win rate be against a 2800 ladder player?

‌I'm watching a match against an opponent claiming to be 2800 ladder.
I'm winning easily as Terran,
but as Zerg, it's 1-1 (I haven't finished the video yet; I lost the game during the macro phase).
If it's Kim Seong-hyeon's main race,
even if the opponent uses cheese tactics, would his win rate be around 70-80% over 10 games?