(facepalm)

Thank you, but no. I typed "Router" when I meant "Query". TanStack Query is the newer name for the library FKA react-query.

TanStack Router is an alternative to React Router.

TanStack Start is an alternative to Remix/react-router-7's framework mode.

The naming history and evolution of react-router and its relationship to Remix is a bit convoluted, but an unrelated tangent to the point I was making.