For these you’ll notice almost everything is in focus. While it is true you can use HSS and a fast shutter, it is far more likely he’s shooting at f8 or higher with a low iso. Even on cheap flash models your flash duration is typically faster than most cameras highest shutter speed (except in hss when the duration is intentionally longer so it can sync with the shutter). 1/10000 or faster is achievable in most mid range flashes.
For these you’ll notice almost everything is in focus. While it is true you can use HSS and a fast shutter, it is far more likely he’s shooting at f8 or higher with a low iso. Even on cheap flash models your flash duration is typically faster than most cameras highest shutter speed (except in hss when the duration is intentionally longer so it can sync with the shutter). 1/10000 or faster is achievable in most mid range flashes.