As I understand it, he is redefining what is called the event horizon, because it is a relativistic concept that doesn't work well with quantum mechanics. One

As I understand it, he is redefining what is called the event horizon, because it is a relativistic concept that doesn't work well with quantum mechanics. One consequence of that redefinition is that humans could theoretically survive crossing it, contrary to the firewall hypothesis (well, if they were in a sustainable capsule with a large gene pool, and the hole was rotating just right), by waiting long enough on top of it until the hole evaporates (from the capsule's point of view). Time would indefinitely slow down for them, so they would see the rest of the universe speed up until the hole dies.