Tesla has discontinued the solar roof, as far as I know. That was basically just a stunt to use Tesla's money to bail out Musk and his brother. The solar wall is a better example of what you mean though.
People are great at finding ulterior motives for people they've already decided they dislike. I don't think Musk is an altruist, and I'm certain he has multiple motives for the ventures he cares about, but I think it's hard to deny that he's found success where others have struggled, and that his ventures will ultimately benefit humanity.
You can order it, but apparently [0] they are deploying on the order of ~20 per week overall, so it's unclear if you'll ever get one. You're right though that it's not discontinued - sorry about that.
