Actually, Kyle Busch said basically what you said on that "Race To The Championship" show that's airing on USA Network. I was surprised how candid and blunt he was in speaking about Coach Gibbs at two separate points in a recent episode.
First he spoke about how Gibbs always told him he was their main man, the foundation of the franchise, and would always drive for JGR until he retired from the sport... which Kyle characterized as Joe lying to him. Later he spoke about how Joe always covered for his bad behavior and bad attitude, always had his back with sponsors and everyone else... until earlier this year that suddenly stopped like turning off a lightbulb (I'm paraphrasing, can't remember the exact quote). I was surprised the show's producers decided to include Kyle's blunt remarks about Gibbs.
If Joe really wanted to make a teachable lesson out of the incident, he would have asked 23XI to yank Ty Gibbs out of their cup car for Martinsville and Phoenix, put JHN or Brandon Jones in the 23 instead. By not doing that, Joe's message to Ty was just words... "I'm telling you that was not right, but there are no actual consequences."