Probably a minor issue, but...
According to the article, the problem can be managed now that the cause is known.
I think this statement:
"The surprising finding, published April 14 in Nature Materials, could affect the up-and-coming electric vehicle industry"
is a bit overdramatic and unnecessary.
This has been known for quite some time. I remember researching tips on the care and feeding of my laptop battery a few years ago. It said start charging when it hits a fairly high level (80+%), but sometimes the battery meter will be off and you'll have to empty the battery to reset the meter.
Besides, on a car as complicated as Tesla, I'm sure they have more than 1 voltage output sensor calculating remaining charge