True enough, but it is rather questionable no matter whose idea it was, IMO, for MS to claim it's "added special hardware support" when it's base architecture feature, which MS definitely knew at the time.
Like I said. RDNA 2.0 might not have originally had the additional hardware but MS then wanted it added and amd just rolled it into 2.0 because perhaps it did improve performance for them for their own needs or perhaps to get added into azure or any number of reasons. Doesn't change the fact that MS is the one who added that special hardware support.
Now MS was very keen on claiming to be the only console with Full RDNA 2.0 support and so perhaps the modifications that Sony did , did not included or excluded these enhancements and thus deviated from RDNA 2 at that point