Agreed, though I think he didn't want to trap beauty too much in a specific formulation on that particular point.

It seems the beauty point is more about an open question: is the artwork attempting to celebrate beauty?

Principles of beauty exist, yet beauty is not the only component of value in an artwork. If we add the attempt, the striving toward beauty as one of a number of points, then that point doesn't overshadow the other possible values that an artwork can have.

Perhaps we don't need to pin down beauty with too many restrictions of definition.