Well, he said they they have Timid Natures and perfect IVs, and I'm going to assume EV spreads of 4 HP/252 SA/252 Speed:
Latias
302 - 80
201 - 94 (?) (Base 100 would yield 212)
276 - 120
379 - 140
336 - 150
350 - 110
Latios
302 - 80
255 - 124 (?) (Base 130 would yield 266)
236 - 100
419 - 160
276 - 120
350 - 110
So except for their Attack Stats, those Base Stats seem to be correct. Maybe I'm doing something wrong with the stat calculations, but as far as I know I'm not. More than likely their Attack IVs aren't quite perfect, which would explain the discrepancy.