Anybody else here thinks Pete Wentz is a "fake" bass player?

If you look at all videos of Fall Out Boy live, it seems like he's faking it and probably playing along to a backing track or there is a touring bassist backstage that is hidden from the audience.

He had a project called Black Cards wherein he also plays bass but if you go watch their raw live videos, it seems that its mostly the guitarist/keyboardist and drummer that's doing most of the work.