Couldn't read the article, only the summary, but it sounds like glitching by the description. I expect the ECU lowers 12V to 5V or 3.3V by using a buck converter which includes a filter capacitor. To glitch the CPU, the 12V would need to drop well below 5V to have any effect. I don't see how this could happen. If the battery is weak enough to drop below 9V under any conditions other than a short, that car won't even start. My suspicion is that they glitched the ECU power supply directly, not the 12V input - the summary doesn't say.

My conclusion is that it's mosty (scientific) clickbait.