According to this those specifications could be real
Davo • 15 hours ago
Canon R5 is a 45MP dual pixel design which means there are actually 90M pixels on that sensor.
If 85MP are in quad pixel array (4 pixels under each microlens) to get binned 21.25MP output but had a mode to address all 85MP, I think it’s believable.
We consistently hear the 1DX and D# market prefer the lower MP output and Canon already has a R5. If this is a direct 1DX replacement I think a quad pixel 85MP sensor binned for ultrafast 21.25MP output is plausible.
Not so sure bout the rest of the specs though.
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Itai Davo • 11 hours ago
You're on to something here. For sure, 85 x 4 = 340 MP packed into a Full-Frame would be seriously difficult and no way it would keep its dynamic range.
However, if you think about it, the reason the have to double the sensel count for Dual-Pixel AF is that they can't reconcile the phase from light passing through different color-filters in the bayer pattern.
They may have found a way to get around that and just have different microlenses on adjacent pixels rather than two or four on each. We already know in a 3x2 group of pixels, 2 are green, so those already capture phase of matching wavelength, they then need to work out the red/blue ones. This I think will allow them to essentially keep the sensor circuitry at the same level as the 45 MP one they already have.
https://photorumors.com/2021/03/04/have-a-laugh-at-these-canon-eos-r1-camera-specifications/ 
