That, and the 10-second thing. Bottom line: I don’t believe the story. As stupid as it sounds, it’s a cover-up for something more stupid (or less legal).
While it might be theoretically possible for someone to pass out from holding their breath, I sure haven’t ever been able to do it, but even if I could, it would take at least 3 minutes, sitting passively.
I suspect that something else was going on, and this is a smokescreen. Either that, or the guy has a serious medical condition and shouldn’t be driving at all (and then probably isn’t guilty of any crimes, if he wasn’t aware of it.)