There are times when these rumors are correct, but on other occasions they make a terrible mistake. At least, this time the protagonist of this rumor is responsible for denying them: no, Matt Reeves does not leave The Batman to his fate, so he will continue to lead the project.
As for The Batman, we still do not know as much as we would like, beyond that Jake Gylenhaal wanted to star in it and that it will not be a reboot (again) of the Batman universe, or at least that is what has been rumored for now . Seen the seen, even we should not rely so much on these rumors, will not have to come to Reeves himself to tell us things.