I think he's spraying, aye. But the nominal thickness of the Rusto / Dulux etc. coats is greater than 2k etc. Atomising it through a sprayer would (in my head) make the applied coat thinner still.
Spraying should mean the coat dries faster, enamel paints are pretty inert unless you pour 2k / celly thinners on them or something.
You are using mineral thinners / white spirit aren't you?