I see it totally normal that Mudryk didn't perform very impressively this season. Because the whole squad of Chelsea were very inadequate. Their morale was so low that they even gave up on the season quite early. In this situation it wouldn't be a healthy assessment about a player. There is a new period starting for Chelsea now with Pochettino. This is going to be the most important time period to watch Mudryk's capabilities. If the team make a good start the expectation from him will also be high.
If he still can't impress people then I will also agree with the people who think he isn't good enough for Chelsea.
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. With how he turned out at Chelsea am sure it would be a relief that he didn’t go to Arsenal else they would be making him the scapegoat for the Gunners inability to win the Premiership.