I actually looked at Section 138 of the TAPPS by-laws because it was brought up on the organization's webinar yesterday without making reference to T-CAL specifically.
While I communicate regularly with Bryan, Steve and Robert on the TAPPS staff, I've not discussed this with them. My GUESS is that it has something to do with T-CAL letting in every school that TAPPS has disciplined over the years (Cleveland Heritage; SA St. Anthony (which is back in TAPPS now) and the latest Cedar Hill Trinity Christian).
If that's the only reason, I understand that you may take a hard measure to try and force change. However, I don't know if there are other reasons.
The part that I personally struggle with - as someone who tries to promote and publicize all schools that are not members of the UIL - is that many schools with coaches and kids who would never ever think of breaking a rule - and enjoy the spirit of fellowship in T*CAL (and maybe some for competition reasons) - are impacted by this. I've been at a T*CAL championship event (in 2018 maybe) as well as seeing a school at today's Six-Man Shootout in Waco and have seen kids and coaches working hard with excellent sportmanship and fellowship. Again, I'm challenged by it because these young men and women only get these chances one time.
Sorry that I don't have any more information to give you. Wish I knew for sure and how to remedy it.