Yeah, I'm also very sceptical. Not a lot of opportunities for microsleep behind the wheel of a F1 car. But also not a good excuse for crossing the white line six times.
My dude drove like shit and wanted to blame anything but himself, thus, "I passed out in the car driving in a circuit at 300kmh but you didn't even notice hahaa"
I mean if he actually had passed out FIA would be balls deep into investigating whether its safe to drive in those conditions