Earlier quoted context omitted.
I think that fits more into "ridiculous economic Chinese finger trap" than "security feature." It's similar to calling gold's physical weight a security feature, but at least there's a consistent and non-economic relationship between how much gold you have and how hard it is for someone to pick it up and walk away with it. (It's also not immediately obvious that "more electricity" is needed to attack it, since a hand…
Larger pools doing that would be subtracting energy from the honest side, and adding it to the dishonest side, so the logic still holds
Why would that be the case? It isn't necessarily zero-sum; the more realistic scenario is that the remaining honest participants ramp up their energy consumption in an attempt to prevent the attack.
But that's still only the most boring of the many, many latent threats to Bitcoin. Solar flares and electronic warfare strike me as more interesting.