This is not a documentary or interview, at all. It's a poorly disguised advertisement for that embarrassing Elton John biopic, based on his tell-all book. The only memorable thing in it is Elton talking about his evolution towards wearing wigs, but that probably happened because of their rise in popularity with women. He does choose a good wig, but that's the only part of this I enjoyed. Maybe you'll hear more about the details in the film, but as someone who loves Graham Norton's British show, this doesn't have a shred of pizzazz like that has. He marvels at the living room where the interview takes place, but Elton doesn't even have the graciousness to take him on a tour of the house or palazzo he lives in.
Only watch this if you loved that terrible movie.