The suggestion wasn't to not get pre-approved. The suggestion was that is not the first step, and it isn't.
Simply telling the guy, who's new, to just go out and get pre-approved without first either asking the necessary questions, or advising him to ask the necessary questions, is irresponsible in my opinion.
I'll reiterate, if what he wants (a multi-family) either isn't plentiful in his area, or costs far beyond what he can pay, it's absurd and a waste of time to get a pre-approval. It'll serve no point, only for him to find out he's approved for 475k, when the properties he wants in his area are 975k. He can find this out on his own. That's why they have mortgage calculators, or pre-qualifications (*not pre-approvals*) available for these type situations. You don't just go get pre-approved without knowing a thing about your market.
In my opinion, that's poor advice to give a new person who seems to know little about real estate or the process.