Each second of an animation is at least 24 frames * 60 seconds * number of minutes with the average 90 minute animated film at 24 fps * 60 * 90 = 129,600 frames so far from 10 frames. You need fast I/O to distribute the workload, move the scene assets to render workers and move the finished rendered scene back to a central node to combine into an animation. Isn't Thunderbolt 4 a ring topology so an ever increasing bottleneck beyond a few nodes if it has to recopy data from node to node along the ring to the destination node? Furthermore, supposedly only 22Gbit/s of Thunder 4 40Gbit/s is usable for data transfer. For comparison, PCIe 4.0 x16 is 31.5Gbyte/s (not Gbit/s) and if you need more than 24GB VRAM you can upgrade without throwing out the whole system to
300W 48GB RTX A6000 with 115.2Gbyte/s NVLink between a pair and with a 64-core Threadripper Pro 5995WX as used in the YouTube video it has 128 PCIe 4.0 lanes so plenty of I/O bandwidth. Nevertheless, it'll be interesting to see an M2 Ultra render farm on TB 4 ring for science.