That's true if you're developing a SPA or static site with SvelteKit. However, there are APIs that involve Node being run in production, i.e. the authors of SvelteKit envision it being used to build hybrid apps that involve front-end JS and Node.js server/s.
Yes, the whole point of SvelteKit is that it's SSR+hydrate. But it doesn't need Node for that. It'll run on just about any Javascript engine, including Cloudflare Workers which is quite close to pure V8 + standard web APIs.