He sounded like Patton Oswalt, but when I saw Eric Bauza credited as guest cast, I'm pretty sure it was him.Same, but he's not credited, so it's probably one of the regular (or semi-regular) cast doing a voice. Or a long-shot uncredited cameo.
I'm really curious where this season is going with these rifts? Could it be the work of Evil Tasha? Will we end up seeing another TNG reunion across various timelines? Find out next time, same Trek Time, same Trek Channel!