Technically, this is speculation but come on. Yes, Atlus is most definitely (in my opinion) making Persona 6 right now. I would even hazard a guess that it is closer to finish than is not. With the Persona team’s last release being three years old with Royal, there is no way they are not making Persona 6 right now. It has likely been in development since 2016 after Persona 5’s release.