Preferences based on extensive experience do count for a lot in my book.
And Paul is...well, "oblique" in his public utterances. The "tests" were done, as I understand it, with the help of Dana Bourgeois, and frankly, I'd not expect PRS to be totally forthcoming in the same way as T. J. Thompson or Sr. Romanillos. Paul plays his cards close to the chest, as it is said, and he doesn't reveal all in quite the way we here are used to. If he feels that he has a "secret" that gives him an edge, he's going to keep it that way.
BTW, I think quite highly of his electric guitars. They're damned good. Just don't go thinking he's going to tell you all about how they're made.