Forgive my ignorance, is this game being rendered remotely and streamed to the client? If so, I can’t say I find those numbers too extraordinary. 4K+ streaming moves a lot of bits.
Also, if anybody else was pushing this bandwidth on Azure it'd bankrupt them. I presume Microsoft are giving themselves an anticompetitive advantage (instead of making their fees fairer).
So "full fidelity" means ~8:1 compression ratio? At 60 fps it's closer to 4 Gbps so ~20:1?
Not to mention 8 bit video is not great and susceptible to banding as well as in general already concidered compressed in color space even when "uncompressed".
You can probably get away with streaming it at that quality but by any of my definitions it's not close to high fidelity.
I was under the impression 50Mbps was very good, even for 10-bit HDR 4K.