Microsoft released a video that covers effectively all of the Xbox One security system, and it's referred to extensively in the talk. The specific methods of glitching don't require any insider knowledge.
They also told everyone they added more anti glitching to later hardware revisions; which by the process of elimination tells everyone they thought this was possible.
The whole initiative was a success when it gave them a year; an unqualified triumph when it gave them the whole generation; they really are not going to be to sad after 12 years.
Right, as Markus says - even gods can bleed. And he's right: Tony Chen's team did god-level work with the Xbox One security system, so what must have followed in the Xbox Series S is truly unknowable. I don't think there's even a tech talk on it. This talk is probably the most elite hacking talk I've ever watched. Everyone who worked on this stuff at MS can and obviously should be very proud of what it took - especially as this probably won't have any commercial impact on Xbox game devs or multiplayers.