Ok, so in general I think all of the Elton John autographs from this promotion don't offer much that specifically could be used to establish authenticity. In this case I am looking at the fact they're from a Banquet-own campaign (who I hold very high in terms of trustworthiness, comparable to Newbury Comics), in my opinion they're all roughly consistent and they match Elton's signing in the video. Their simplicity is in line with what was announced beforehand.
Can I say only from the autographs themselves they are definitely from Elton? No. But do I have doubts based on the overall circumstances? No, neither. Goes for the silver ones as well as for the gold ones ;)