It was not obvious because my statement is factually correct and yours is, at best, irrelevant!
Your making a statement about “features” of the DB20-G in Chirp that you admit you have not even tested!
But whether it works or not in Chirp, transmission on Channels 8-14 has been available on the “opened” DB20-G since Day One!
No need for testing in Chirp!
Furthermore, IMHO, transmitting on Channels 8-14 at 20 watts and/or Wideband FM, is morally reprehensible!
The ONLY time one should be doing that, if at all; is if they heard a weak signal on Channels 8-14 requesting EMERGENCY help!