Ok, so where is your proof that N22 absolutely needs 192bit GDDR6 + 96MB IC? That AMD slide doesn't really show that.The 6700 XT is expected to boost higher than Navi 21. Even an AMD slide shows performance per clk starts to slow down from 2200MHz. Imo 6700 XT absolutely needs a 192-bit bus + 96MB L3 cache if its boost clock is really 2500MHz. It'll be just as good as 3060 Ti at best though.
Even If N22 is clocked at ~2.5GHz, that is only 14% more than 2.2GHz and for that you don't need +50% bandwidth and + 50% more IC compared to a hypothetical 2.2GHz RDNA2 GPU, which is 1/2 of N21(40CU, 64ROPs, 64MB iC, 128bit 16GHz GDDR6 ).