I'm not hugely fond of this specific article; I think the dissection of the SEC filing misunderstands what the accusation is. (Specifically, it's not having the bug, it's the lack of mitigation for large bugs in general.) To me, the "this is not a post-mortem, here's why" part would have stood better on its own.

But I appreciate the writing style, and I've got his site bookmarked for more systems safety reading in the future. It's a slog, but often this sort of ruthlessly-comprehensive breakdown is the best way to understand exactly how a complex thing went awry. Reading them every so often - even for non-software topics like drug treatments - seems to be a good refresher for my own error-analysis skills.