How search engines index Bio Pages
Published pages are indexable; there's no way to opt out.
A published Bio Page allows indexing (robots: index, follow) - search engines can crawl and rank it like any public page, using your title and description. There's currently no setting to mark your page "noindex."
A page that hasn't been published yet (or one that no longer exists) returns a "not found" response with indexing disabled, so drafts and removed pages don't show up in search results.