My initial thoughts were that the revision to stepping E0 could be the update to RDNA2 too as well. I asked about it here if revisions are merely tweaks or possible major upgrade. Chip designs and such are not my forte.
I can see it being possible as per your scenario being true. Only issue here is we don't have that crucial data on latest steeping E0 (outside of bandwidth tweaks) with ps5 test case profiles. Frustrating indeed.
Then again all these data that we have, could be irrelevant. Maybe it is for one of the Dev kit revisions. Can't rule that out either

Actually it's interesting you bring up steppings, because another user here corrected me about that yesterday. I forgot their name unfortunately, but they linked me to AMD's key nomenclature for their chips. With something like, say, E0, the letter actually represents a revision, while the number represents a stepping.
So Oberon's gone through at least four revisions, and at least as many (likely more) steppings, with revisions being the more pronounced of the two. I used to think revisions called for the actual codename to be changed, but that doesn't appear to be the case at all with AMD.
But yeah, going by that revisions fall more in line with major upgrades. E0 was a revision that made changes to the memory controller by fixing some bugs in the silicon, hence why that revision now has larger bandwidth versus the other revisions. I'm willing to entertain with the data we have now it could ultimately be irrelevant, or for a dev kit revision. I remember some insiders saying a new devkit was sent out this year? If so those devkits probably have Oberon E0. If yet another devkit comes out soon, it could have another Oberon revision, F0, and I'd probably take that to be
the final revision before they really have to finalize everything for optimizations and production heading into summer for a fall release.
In case anyone is interested;
How Microsoft hopes to have the visual edge over Sony’s PS5 with Xbox Series X variable rate shading
www.gamesradar.com
From what I understand, I think the "RDNA2 exclusive to MS" thing was a misread about the Direct X RT implementation, which MS and AMD have collaborated very closely on and is exclusive to MS. However, as it's an API, Sony will have their own version of it, calling it something different, but essentially it'll be much the same thing.
They could've caught wind of this before any clarification on RDNA (or the conference itself happening) and assumed from earlier (old) rumors that RDNA2 was exclusive to MS like the even
earlier rumors Navi was exclusive to Sony. And I guess they read too much into lack of clarification from Sony (even rumors saying their RT would be proprietary, including some speculating PowerVR RT) and assumed what they did about RDNA2.
They were obviously wrong and could've just waited a couple of days to see the conference itself, but some folks can't help it I guess
