[Fran Tenreiro]

You can shift all cars without the clutch when you know how – I don’t know how common this is in today’s racing though. They definitely didn’t use the clutch in F1 when they had standard gear boxes though.

You can, but not for long. Normal gearboxes are not prepared to be used without the clutch.
And no, F1 cars have special gearboxes and if I recall correctly, they have autoclutch managed by the electronics. Even at the start, they only have to release the clutch and then electronics take control of everything