I think the list is accurate up to "highest note hit in a professional recording", but that could be misleading. It isn't sustained, nor is it entirely free of altering. And, it is missing close to a million singers. Notables missing are both Tim and his son Jeff Buckley which are supposed to be in the 4+ octave range.
And with that said, your octave range means very little when it comes to style, writing, and phrasing in songs. Sure, it is impressive when artists (mostly notable divas) hit those high notes, but if the song is crap, it is still well performed crap.