I think that's excellent advice to any one changing something significant and able to affect performance like props, battery or RC antenna; go for a "round the block" flight for a full flight duration, we call that a 'shakedown' in engineering, and it's done with everything from a family car post-service, to an oil tanker with a new propeller to make sure nothing falls off when you go to use it. Accidents happen in manufacture/assembly, materials can vary in quality, even if QA clears it at the factory, a few months in a boiling hot/freezing cold ship container can change that state by the time you get it.
I don't think OEM or not is a big deal if both are made to the same spec - I remember reading about many people getting a "bad" Mavic out of the box when they were rushing the units out last year. But it's just good common sense to limit your risk with unknown, unproven equipment. I was wary with the new DJI battery I bought earlier this year. It may be OEM, but you never know if the guy in the factory had a bad day, or the delivery guys left it out in the rain for an hour then dried it out.
It's why real pilots have checklists, strain fuel and do run-ups every flight. It's annoying as hell when you just want to go for a rip, but I've gone back to hangar before because something wasn't right during the run-up. Stuff just, breaks, sometimes. It's the "pilot"'s job the notice.
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