It would be more impressive if the site was actually running on the original server and software, but I imagine that machine is safely tucked away in their museum.
The historic NeXT computer used by Tim Berners-Lee in 1990, on display in the Microcosm exhibition at CERN.So even if they upgraded the original Motorola 68030 or 68040 running at 25Mhz to something much newer, it would still be dead in the water with any sizeable amount of traffic.