One of the first places "I'd" look? It's not my Mac. I'm not sure how many primary headteachers read Hacker News or have a spouse who does. I'm guessing <1%.
When the world's biggest software company actually bricks people's Macs with a software update, then "sorry" is the least I expect, frankly. But if you want to dismiss this with "dickhead", you do you.
I'm torn on that one. I want direct communication to be possible without running it though PR or people with PR training, to improve response times especially in such "busy" situation. This requires us on the receiving end to be somewhat lenient. But on the other hand, I also don't find something better elsewhere, including the more official announcement[0] linked to. Thus this style seems like company policy and certainly deserves criticism.
Do you want only PR people on HN trying to talk to you? Because this is how that happens.