At his age I would recommend he finishes some sort of (back-up plan) degree before diving head first into an integrated course and potential financial ruin.
The next couple of years he should continue to fly on his PPL and build some decent experience.
The market would look completely different in a couple of years.
I don't think anybody right now is waiting for another unemployed 19 year old "frozen ATPL".
Sorry, didn't want to be a buzz-kill but just offering an opinion.