I honestly don't know. The poster was asked several times to post photos of the motherboard but never did, even after supposedly opening it up several times. Earlier in that thread he mentioned how he didn't want to open it at all or ever mod it as it was a new-in-box system, then by the end of the thread he ends up cutting the wire and region mods it. There's a pic of the finished mod with the switch being shown, but still no pics of the actual motherboard. Maybe he only had bootlegs which were altered slightly, which is why they always shown Bare Knuckle. He never posted pictures of the games either.
A lot of the stuff he says doesn't make complete sense. Why would it have been available from the Sega store at all? He says he's from Europe, why would the Sega store stock new asian Mega Drive consoles? If it was used, it's possible the guts were swapped at some point. I really don't know what he has, it's just that it's supposed to be a PAL console, the video he linked to in the first post shows an unboxing of the same type of system and it's PAL.