If navi 20 has RTRT but the rest don't then that could mean a couple things, not specifically hardware based but navi 20 is beefy enough to run it through standard compute.
Or
Hardware optimised which could mean Sony asked for it to be included same way they got RPM from vaga included into 4pro. Which may mean it didn't need to be as powerful.
So that doesn't actually tell us anything about power as we don't know about navi yet even as a basis.
2TB SSD would definitely add a lot to cost. If that's what you think it will have. Not that it was said, but fair that's what you think.
Support for 8k graphics just means it supports hdmi 2.1, it doesn't give any indication of power at all, if every navi gpu doesn't support hdmi 2.1 I'd be very surprised. Did he say what level of graphics it could do at 8k, he didn't even say what it could do at 4k.
So 8k graphics could be very cheap because it doesn't mean anything by itself apart from hdmi spec cable.
The only thing that was demoed was spiderman. Was that at 4k60, 4k120, 4k at all? We don't even know that, what was demoed was not really about the power of the console but about its data streaming capabilities.
Which their very proud of, and maybe for good reason.
You say this based on not knowing anything about how powerful the ps5 is though?
Simple example how many TFlops is it?
Speed of CPU?
Whilst I'm happy for Cerny's interview, I think people are putting words in his mouth.
Most of what he said wasn't even ambiguous, which is nice. But he never gave any specs at all.