No. There's no other way to interpret this. He's flat out wrong.
The problem is, just because someone is a Christian, or even the Pope, doesn't make them infallible. They approach things with their own prejudices and misunderstandings. They don't have enough information available to make a decision. They make mistakes. They get things wrong. We get things wrong. We all do. Across all walks of life. We're not all at the same point in our respective journeys, some are younger, some are older, some lack the exposure, others don't learn as fast. The best we can do is accept that and try and get our message across with love and understanding.
Some however are just plain bigoted.
As I say, I think especially in the case of trans people, that, reassignment, or HRT, should be seen just like someone taking a steroid cream for a rash, or having surgery to remove a birth mark. I don't mean to minimise what anyone goes through, Im just trying to get across that it should be seen as normal, allowing you to be who you want to be truly are. We wouldn't let any one suffer with any other medical condition, why should trans be any different?