No one's using "gamer NICs" for high speed networking. Top of the line "gaming" networking is 802.11ax or 10GbE. 2x200Gb/s NICs are available now.
Gaming parts are strictly single socket - software that can take advantage of >64 cores will need server hardware - either one of the giant Ampere ARM CPUs or a 2+ socket system.
If something must run in RAM and needs TB of RAM, well then it's not even a question of faster or slower. The capability only exists on server platforms.
Some workloads will benefit from the performance characteristics of consumer hardware.
Workstations and desktops are distinct market segments. The machine in the article uses a workstation platform. And the workstation processors available in that Lenovo machine clock slower than something like a 5950X mainstream processor. The RDIMMS you need to get to 1TB in the machine run much slower than the UDIMMS I linked above.
