I agree that celebrity endorsements are effective. The question is
why are they effective. I disagreed that celebrity endorsements influence perceived quality. This is different than perceived value which includes many factors, one of which is perceived quality.
A google search provides very little studies that address endorser on perceived quality of the product. The couple I found provided mixed results, with questionable applicability to western audiences (E.g. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2814907).
Those who are asserting that its obviously true that endorser influences perceived quality apparently do not have the literature behind them.