From the pics it looks like that section has been re-dyed (repainted more accurately). If this is the only section peeling than it is almost assuredly what's going on, otherwise you'd see far more peeling issues on the areas that get much more abrasion, especially the lower driver's side seat bolster.
It's very common for dealerships to re-paint seat panels due to minor damage or discoloration before selling it new to the customer. Since you got this many miles/years out of it I'd just find a reputable leather guy and have them painted again.
Thanks for your insight.
I'm the first owner of the car and bought it new in 2015. I’d find it hard to accept that it was “patched”.
I was at Tesla SeC today for the summer tires and the worn out armrest.
My armrest is fake leather and I was not really surprised that it started breaking. No question here: this is genuine wear so on me.
But the headrest does not feel like it should be one me.
The Tesla guys looked at it and I was in the end not surprised to hear very frustrating comments
1) Tesla young tech: “this is because the car is old and you used some product that damaged it.”
My answer: no, and real leather does not peel off.
2) Tesla front desk : “this is actually premium material but not leather”
My answer: no, this is real leather. 5 years ago cars came with real leather. Real leather should not peel off.
3) Tesla front desk goes back to talk with the older guys (which I know and very disappointingly did not show up. But maybe because of Covid). Comes back: “yes indeed, it’s real leather. Are you sure you did not use some product ?
My answer: “no, just a paper tissue.”
I stopped there, as there is no point except for me to get more frustrated.
I had decided to keep the car for the long run, as i really like it but I hope I’ll not bump in more unexpected unusual wear like this.
Found several business that do such repair, hope I chose the right one.