alt Hacker NewsExactly 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.