Unless I missed something Elton John testified at trial as a defense witness. Like fuck Spacey but this is a nothingburger. Giving testimony under oath in a trial is a basic part of how our justice system works.
I think Elton John testified in Spacey’s trial and sorta corroborated Spacey’s alibi that he was somewhere else when the assault in question happened. I didn’t really read much into it but that’s how I understood it. Anyone correct me if I’m wrong.
He was called to testify as to whether Kevin Spacey was at a particular event that he and his husband hosted - I don't think they had much of a choice. Theirs was just part of a bunch of evidence that Spacey wasn't there.