Bob is not the oil guy, at least not in my opinion.
Your first mistake was getting a flush. Your second mistake was getting a flush at a quicky lube place. Did they drop your pan and clean/replace your filter? I doubt they did.
Normally I am opposed to doing a transmission fluid flush, I much prefer the drain and refill approach, but you now have one of those rare cases where I have to recommend another fluid exchange, but it has to be done right.
The pan must be dropped and the filter cleaned or replaced, then the pan goes back up, the transmission is refilled, and then the fluid exchange machine hooked up. The reason it has to be done in this order is that the fluid exchange is done through the cooler lines.
If the old transmission fluid is in the pan, then you are sucking the old fluid out one side and putting fresh in on the other. The problem is that the fresh is being dumped into the old so you are not exchanging the fluid, just diluting the old with the new.
Even doing it the proper way isn’t 100% because not all the returning fluid goes through the cooler before returning to the pan, but it is much better than not dropping the pan.
Once you do this, then just drain and refill the transmission every 30k miles, do not worry about a complete exchange. If you follow this practice, your ATF will stay fresh enough to help your transmission last the life of the vehicle.