It was an anecdote. If a 17 year old can socially engineer twitter, I don't think it's crazy to think that a room of comp sci PhDs in South Korea couldn't figure out how to mess with infrastructure, in fact I'm quite sure they could. There are not 3 countries in the world who could cause this type of outage, there are many.

Do we know a lot about Apple's internal reliability/security engineering? Google writes books about it and has things like Project Zero. Windows is used by governments everywhere and so Microsoft probably has some contacts in high places. I have never heard anything about Apple.