I was chatting with a sales advisor on the US site, and asked what the purchase price would be at the end of a Model X lease. Was surprised when she told me that Tesla offer no more option to buy on any cars now. I knew that was the case for the 3/Y, but this is new for the S/X, right?
Email Tesla Finance to get an official response. I don't think that chat support would be fully knowledgeable.
Maybe this is how it now works with all cars. My 2018's lease is up in June and they sent me a message the other day giving me the option to buy it. I am going to replace it with 2021 refresh so did not look at the details.