According to the blog post, it requires an NVIDIA Jetson Orin with at least 8GB RAM, and they've optimized for Jetson AGX Orin (64GB) and Orin NX (16GB) modules.
Yeah they didn't really mention anything, I was almost getting my hopes up that Google might be announcing a modernized Coral TPU for the transformer age, but I guess not. It's probably all just API calls to their TPUv6 data centers lmao.