I guess "yes" wouldn't be an incorrect answer, but a more nuanced look might want to consider that node does actually contain the js runtime of a browser, just minus all the rest of that browser.

A wasm runtime can be far more lightweight than node, not only because node itself is a wasm runtime, plus a lot of other things. Wasm could (or does, already?) occupy a sweet spot where platform independent extensibility is desired, but where that is not enough of a core feature to make inclusion of a heavier runtime advisable. Kind of like how Lua has its place, but with more focus on near-native speed and less focus on ad-hoc programming (aka scripting).

Bun is a runtime.. If you're referring to the fact it can produce a single binary, Node.js can do that too.