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Exactly the same thoughts here (I've been looking into FCC part 15 myself too). And IIRC nRF has some pre-cert stuff to avoid going through the full gauntlet.

I'm guessing he's using the fact that dev boards are excepted (as opposed to final products). Somewhat unfortunate though, as these do end up in a lot of people's boards.

nRF modules are pre-certified to avoid this issue, but OP integrated the chip into their own design so the certification is entirely on them to obtain compliance.

And that's why he built the product and I didn't. Some people just do it and solve for regulatory problems once they have pmf. I get lost in regulatory weeds and never get off the ground.

Not really, no.

The product launch was a group buy of minimum 400 units. You can choose one of "compete with China" or "expensive product testing requirements for small-run products".