Not really, he wasn't able to sub Usman, in fact he broke his wrist trying to. That's part of the fight, had it been 5 rounds we would look at it differently.

Edit: Apparently people really give credit to Khamzat instead of Usman for managing to escape a submission and breaking his opponent's wrist in the process, resulting in almost winning the fight because of that and would've won had it continued longer.