you can source wild with a high % likelihood of diseases, being suppressed and balanced from the diet/feed/dilution/water quality and habitat they're used to but now moved into a barren home reef aquarium, or, you can buy the second step of that where a pro pre readies them and removes probably 80-90% of that risk
the final entry to your tank is your resp
not Dr. Reef's
the fact he can do so well that the majority don't have to be responsible for the final observation step, like a zoo would do, means he's meeting a market niche demand anyone can appreciate.
what a zoo would do is source the safest bet animals matched for tank environs
and then run their own observation/ fallow setup before entry and that's the best you can do in reefing fish keeping ethics
a zoo doesn't use a sterile bright barely cycled scary bright qt tank, forum reefers do that shortcut
a pro has an observation fallow system with no disease vectors, muted lighting, hiding spots, low reflectivity, aged and ready to receive, such that pre-observation can't be whined as harmful to fish. they might even preemptively treat known risky species, in addition to what Dr. Reef does, because they're not in a hurry to get into the display. they want to be deliberate, thinking for the long haul.
all the people you read whining about disease from Dr's stock were lazy but not in a flippant way, they paid for prepped fish, but in the end they wanted to cut prep corners.
if I was a fishkeeper I'd apply all of Jay's prep advice from the stickies in his forum to fish sourced by Dr. Reef.