Not a Chelsea fan but I believe it’s too early to start calling Mudryk a flop from his stint at Shaktar Donetsk he was arguably their best player there. He needs time to adjust to the Premier League which is the toughest league in the world.
There was no player in Chelsea last season who performed close to their level/standard, they were all really bad and thus it is somewhat unfair to single one player out as a flop, but rather the entire team flopped. Mudryk has time to shine, he is just 22 years of age and is yet to have one full season in Chelsea. If Pochettino decides that the Ukrainian is good enough to play in his team, he'll give him the opportunity next season, and we'd then see how good he performs and only at the end of next season can we now pass appraisal on him.