Highest note sung?

I know, maybe some of you have seen the video, but in YT, search up "David Bowie Anaheim 1974", the first video that pops up, go to 1:30:20 (Rock 'n' Roll Suicide) or 1:38:40 (Something Up There Likes Me), Bowie hits the whistle register continuously with his highest note recorded, D6 or Eb6