uh, ok, well let me try to explain that they DON'T HAVE TO DO THE WHOLE SONG IF THEY DON'T WANT TO! You can record a higher pitched vocal in just a single phrase if you wanted to. The parts where Robert sounds normal, they probably let him sing along to the track normal speed. SImple enough for ya?
Also what detuned issues? I think you are WAAAAAAAAY overthinking this...it is actually a very simple procedure. Once you play the tape at the correct speed with all the tracks the ONLY thing that will sound odd is the voice, which is slightly higher than it was when recorded because it was recorded at a slightly slower speed.
Also you seem to think that if they slow and speed up a tape manually that the listener will hear these fluctuations on an LP. WRONG!!!! They play the tape back at a constant 30ips, or 15 sometimes, to master or mix etc, so however they got the sounds on the tape, and at whatever speed, are all being played back together at the same speed so the effect is a harmonious, intended sound. You seem to think we should be hearing different keys, detuning, weird splices...I dont know, but the obvious thing is that you have never recorded or been in a studio with tape. You have NO IDEA WHAT YOU ARE TALKING ABOUT!
So I am done here. i cant keep explaining the simplest thing just because some numb-nuts cant understand...if you get it, great. if not, then yeah, I guess you are gonna have to call the whole thing bullshit 'cause you DON'T get it!! I guess everything you dont understand is just utter bullshit then, right?
Maybe someone else with more patience can introduce these concepts to you in a simpler, nicer way but I cant and wont. It's not my fault your dense.
An analogy:I dont understand how to fix a submarine but I also dont go onto submarine fixing websites and shout at people who know more about it, and tell them they dont know shit, just because I DON'T UNDERSTAND! That would make me an IDIOT!!