This is him actively trying to come across as supportive. Note how he totally dodges saying if he things trans women are women. Note how he - quite subtly - offers the 'your existence is a belief ppl might politely disagree over framing'. www.instagram.com/p/DMvb-tUBDXI/
He's careful w/his language, but we've all heard this shit a million times before haven't we.
Being generous it does seem like he's not about to make it an issue, he's at least attempting to appear supportive, unlike some. The proof will be in the pudding, we'll see how it plays out in the party, personally I remain optimistic.