How to differentiate between head voice and falsetto?
As far as I can see it isn't off-topic; it's asking a pertinent question about a style of vocal.
It may not be the best question of all time, but it doesn't appear to be 'identifying a song' etc. It is asking a clear question about a vocal technique, using a specific example.
Maybe it just needs the 'technique' part adding into the question & the reliance on the specific example dropping into the body of the question?