I've seen a gas car light up just as well. That was also years ago and I don't know if shit has improved, nor am I an expert on the matter. But humidity may accumulate near the battery and explode either way, gas or electric. A gas car in the garage will take down your house just as fine. The gas in the tank is irrelevant here.
Disclaimer: I am also not a Tesla fanboy. But articles like these are rather dishonest in how they present the "information".