I'll admit that the numbers posted seem a bit high to my eyes; however, I assume Tom checked and rechecked everything before posting. After all, if Josh's numbers for testing the XS15se and XV30Fse come back substantially lower, that's a serious problem.
Edit: Also worth noting, PSA's numbers for the previous version of the XV15 were 1dB higher than what Josh had listed over at Data-bass to account for driver orientation. It's my understanding there won't be any such difference this time around as Josh will be compensating for that on his end similar to how he handled other subs with multiple radiating surfaces ala the Epik Empire and Paradigm Sub 2; the XS15se shouldn't need any compensation of course as it's a single driver sealed sub, and there's no base plate to worry about this time.