Doubt it too, because -if I remember the public discussion correctly- how to migrate projects over from node to deno without basically rewriting anything was a question straight from the beginning. And bun was not a thing, or was it? - First bun 1.0 release was 2023, deno 1.0 2020.. so maybe, but unlikely :)
Anyways, that backwards compat is huge
It's probably more about people complaining they can't run Next or some other framework on Deno which directly impacts their business (Deno Deploy).