That is a fair point, as the 2x CPU + 4x NIC are "only" about 550W put together. There's probably more overhead for cooling (as much as 40% of the datacenter's power -- multiplying by 1.5x pushes you just over that 800W number).
That said, being able to do 800G in an 800W footprint doesn't automatically mean that you can drive 100G in a 100W footprint. Not every ISP needs that 800G footprint, so being able to deploy smaller nodes can be an advantage.
Also: I was assuming that 100W was the whole package (which is super impressive if so), since the Netflix serving model should have most of the SSDs in standby most of the time, and so you're allowed to cheat a little bit in terms of actual power draw vs max rating of the system.
That said, being able to do 800G in an 800W footprint doesn't automatically mean that you can drive 100G in a 100W footprint. Not every ISP needs that 800G footprint, so being able to deploy smaller nodes can be an advantage.
Also: I was assuming that 100W was the whole package (which is super impressive if so), since the Netflix serving model should have most of the SSDs in standby most of the time, and so you're allowed to cheat a little bit in terms of actual power draw vs max rating of the system.