You might want to re-read these references as that’s not accurate - it is likely that it said that the TTIG wasn’t able to be registered on v3 at the time it was written, with various levels of panic by the poster depending on if they’d read the previous posts that explained what was going on for migrating the TTIGs to v3. If you scroll down the list of topics you’ll see lots of them about registering the TTIG on v3
Or search, please please use search, antenna length I searched for today to make a wire one that I’d cut short by a couple of mm and found answers:
Device development is a trillion times easier if you have access to the gateway console or even better, the gateway itself.
As fetching as the idea is that Adafruit do bonnets, which actual product do you have and what software are you using to create your device?