Probably not, but 2-0 isn't that safe a lead in football. I don't particularly have an issue with him coming on.
I haven't seen any of it tbh so I can't really form any particularly sensible opinions. But bringing on a senior player to help a team isn't particularly controversial.
One could argue that the assist vindicates the decision.
Also, holy shit he is good. No-one in our squad last year could have done that. What a brilliant signing, definitely a big part of us going up a level this year.