They said it would be down for maintenance, so that's no surprise. The other My Tesla changes are another story. They finally added 7.1 release notes, and left 6.0 release notes, and all older ones are still gone. They no longer have a link for signing up for any sort of service plan. They don't recognize any previously existing user uploaded documents as such, and don't give me a way of removing them. One of the guides that they added around 1/16 is now gone. I don't remember what it was called and would have saved it if I had realized it would have disappeared.
There had actually been a more subtle design change to My Tesla about a week earlier, and one thing that went away is back, so there's no reason to believe that what we see now is necessarily what we will see a week from now.