The thing isn’t only about votes. Both APIs are top priority but there are blocked and depends on other stuff that also needs to be fixed or implemented.
AudioEncoder (bug 1749046) doesn’t really have any dependencies or blockers, as far as I can tell. If there are, then you (or whoever has access) should update Bugzilla and add the dependency there.
Honestly, I found bugzilla hard to read, so I am not sure but it looks like the WebCodecs API needs to be implemented first. And that one has a bunch of other stuff, I think.
The thing isn’t only about votes. Both APIs are top priority but there are blocked and depends on other stuff that also needs to be fixed or implemented.
AudioEncoder (bug 1749046) doesn’t really have any dependencies or blockers, as far as I can tell. If there are, then you (or whoever has access) should update Bugzilla and add the dependency there.