That article is from 2016.
I think the current RX all have genuine leather, except in the North American markets. There doesn't appear to be any mention of Tahara in the current UK spec.
As I mentioned above have a chat with your dealer. It's unusual for leather (even more so if it was vinyl) to crease so easily, particularly in that area. I've heard of upholsterers using heat and steam to remove creasing but on such a new car I would be reluctant to go that way without first taking it up with the dealership.