Well that's the theory. In practice the Toyota Prius with its highly complex hybrid drivetrain is far more reliable and durable than any Tesla. Proper engineering and build quality counts for a lot.
I'm quite curious, most of my co-workers (and me) drive Teslas and there has yet been any drive train issues in any of ours. Two of them have gone over 500.000 km. But what I see is pure anecdotal.
All I can find is statistics on general repairs not drive train specifically and even here tesla is quite high but not on par with Toyota. Audi seems to be one of the worst actually.
I'm not going to out who said what, and note that was 8..? years ago and everyone has undoubtedly improved since then. That said, it was interesting to see near-universal acceptance of its excellence (of course some joked that theirs were actually fun to drive, which was a fair observation). As an amusing aside, at one working group dinner I had to explain to a couple of let's just say European engineers what "Vegan" meant on the menu. Hilarity ensued.