Seems exactly like that old leak from some time ago.
And again that weird 880GB/s bandwidth, which I can't really fit into 16, 18 or 20Gbps GDDR6 calculations for 20GB pool.
What does fit is 20GB GDDR5X with 11Gbps modules, but that requires 640-bit bus.(not sure how feasable that is, though 390 and 390X had 512-bit bus).
Or 22GB GDDR6 wiith 20Gbps modules on 352-bit wide bus.