Given the wardrobe choice in this second appearance, this was almost certainly a conscious decision on the part of everyone involved. Dhawan's Master is the Joker.
It's not my favorite take, in particular coming as it does after Michelle Gomez's absolutely pitch perfect arc with Missy, but there are moments where it's particularly bad and others where it sings. Dhawan has a way of just looking at somebody and channeling menace and threat that works really well. But they definitely didn't find the right balance in either of his appearances so far.