I’m smelling an awful lot of bullshit here. If the power grid (or any other major infrastructure) had a known single point of failure that would cause the entire system to collapse, there would be more than 2 people who know about it, and they certainly wouldn’t be vague-booking it to Lemmy.
It’s less bs than you think, still unlikely sure, but not a non zero chance.
For awhile their was a single point of failure in telcom for the midwest in the us. Because the core router was so old and didn’t play well with failover. It took them several months and a lot of intermittent issues to get it replaced and working as expected.