Chris and Tory (and as you say ATP admin) ALL have advised you against trying to remain in school while attending ATP, and therefore if you tell them, they will not allow you admission. You could of course lie or simply not tell them. Every now and then there are people who think they’re “special” and can pull it off and frankly it’s your life and your money. But know that you have been told and WHEN (not if) things unravel, you start busting checkrides and washout of training it’s 100% your fault, NO ONE will be sympathetic, you will lose a considerable amount of money and checkride busts could strongly impact you ever having a career as a pilot.
Decision making based on all available information is a critical and perhaps the most important pilot skill. Merely based on the fact that you’re willing to disregard the advice of people with years of experience on the subject based on your own desires and lack of patience demonstrates a clear lack of judgment and maturity. The good news is when it does happen, rather than being a successful airline pilot you can go online and join the ranks of those who say “ATP is a scam! They lied, they took my money, the instructors are terrible, they, they, they, etc etc etc…”.