I don't agree with his argument. I'd argue that it's perfectly possible for something that took huge skill and execution brilliance to create to be ugly / tasteless / vulgar, indeed completely tasteless.
If you want examples, take a look at https://www.reddit.com/r/ATBGE/ (ATBGE stands for Awful Taste but Great Execution). While I think that taste is subjective, it would be difficult to argue that many of these posts were good ideas.
I have no idea what the right answers are in this area, if there are any. But for me, I don't know that it's so much about skill as it is something that results in the bettering of experience. That might require skill in the sense of technique, but it also reflect lots of thought or insight, or something else.
Where it gets tricky I think is that "bettering" can be with reference to many different criteria — morality, empathy, insight into ourselves, insight into others, bearing witness, emotional peace, and so forth — that it becomes very complex very quickly. I also think that it necessarily depends on where someone, or some group of people are, at some point in time, so it will shift (this also arguably speaks to how taste is a function of the creator, creation, and the beholder simultaneously).
