I've never read nor heard anywhere about Elton having perfect pitch.
He did have the ability at a very, very early age to pick out songs by
ear on the piano. Later, this ability evolved to include the ability
to transpose, or change, the songs into any key he desired.
Just based on his abilities as a songwriter, and performer, he seems
to have very good 'relative pitch' - the ability to sing/play in tune,
regardless of the key of a song. I've rarely ever heard Elton sing off-
key, even in his worst vocal period (86 in Australia) he still hit his
notes in tune. And he still does today.