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Yes, I know how Para's work.
I own a PCB PLM, while not a true Para, I get the essense of them. If he used a hi-end TRUE para - which cost upwards to $5K each (I doubt it from following this photographer (Lachlan Bailey)... he may of rented one though. Not sure. I just highly doubt Lachlan used a $5K para. Most of his work is natural light, or with softboxes.
Also everything leads to a smaller light source to my eye. A 22" Mola Demi can create a hard line like that as well... I guess there's no definitive answer here. Just guessing.