According to a fan attending the show, Tony Khan walked out and shook Atlas' hand so he may have signed a contract. Atlas was one of the names that AEW wanted to sign during the early days of the company in the first half of 2019 but Atlas opted to sign with WWE.
Atlas was never used to his potential in NXT and he was released by WWE in August. In September he announced that he wanted to step away from wrestling to focus on his mental health and to "explore completely different industries to find my passion again." Atlas went on to say, "Unfortunately, it was unhealthy for me the entire time. I just learned how to hide it really well. I hope that friends & fans I’ve made alike continue to support me no matter what."
It certainly looks like he has reconsidered things and he's not active again in pro wrestling.