It's pretty obvious Tony was talking about Garrett. When analyzing his entire statement, it's clear imo. There's multiple reasons why he didn't put Garrett on blast.
1. Tony has way too much class to do that.
2. Politics. He did admit, he DOES want to get into coaching at some point.
3. Avoiding controversy. He might just want to coach the Cowboys down the road. P'n off Jerry, blasting Jerry's boy, probably ain't the best way to do that.
4. It just wouldn't be a good, "look" for Tony to blast his former coach. Tony is becoming even MORE popular as an analyst. He's connecting with people that HATE the Cowboys.
Tony Romo is still pretty young, from a non-player perspective. He's got a LOT of years left to be involved in football. He may be content to ride out the next couple decades as a well paid analyst. Personally, I think he jump into coaching when the opp he desires presents itself. He's smart enough to be patient, & let it come to him.