800 gigabits is 100 gigabytes which is still more than PCIe 5.0 16x 64 gigabyte per second bandwidth.
You said there were 800 gigabit network cards, I'm wondering how that much bandwidth makes it to the card in the first place.
The article however actually talks about Terabyte/s scale, albeit not over a single node.
This does not have anything to do with what you originally said, you were talking about 800gb single ports.
