So I got a call back the other day from Tesla Support about this.
They say that the change from 32a to 30a was intentional, but that the car will still charge at 32a.
They said something about the value printed on there needing to be plus or minus ten percent of actual.
So here is my guess:
The plus or minus 10% is probably intended for things like motors where the manufacturing tolerances are just not that tight. So if you ask for a 32a rating, maybe you have to have it tested to 35.2a as that is the upper bound of the tolerance. Since the Tesla is all electronically controlled they know damned well it is going to always draw pretty much exactly 32a.
So my guess is that Tesla for some reason decided to just ask for a 30a rating, knowing full well that the car would draw 32a, but that is still well within the +10% variance allowed. So perhaps that only requires them to test the UMC to 33a instead of testing all the way to 35.2?
I am not sure, but this is just my conjecture. I am not an expert in UL testing procedures and policies.
At the end of the day, I don't think this is any kind of a risk at all. Though I do wonder: Does this mean for NEC calculation reasons that I only have to do the math on wire and breaker sizing as if it is 30a? As far as I know, this is the "nameplate" for the device.