Often times "Reliability" is calculated as "fraction of cars that have a recall or other unscheduled maintenance during the initial N months of ownership" and I believe Tesla is actually quite high in this regard?
My Tesla has been much less costly to own over the last three years than my Honda Odyssey: I have had several mobile repair visits for cosmetic issues and some OTA “recalls” but I find it hard to believe that any ICE car is more “reliable” than a Model 3 that didn’t gave obvious QC issues at delivery.
I mean, much less maintenance in absolute terms: no oil changes, transmission trouble, etc. Mostly just replacing windshield wipers and tires. The mobile service issues were all basically cosmetic issues that wouldn’t really impact reliability.