This reminds me of the Intel SYSRET bug: https://blog.xenproject.org/2012/06/13/the-intel-sysret-priv...

In which AMD defines a new instruction, and Intel copies it with a subtle difference which trips up everyone (AMD's way is better IMO, and it came first).

He's just very dramatically pointing out that, oh, there are some changes we now need to account for, and Intel didn't tell us poor open source developers about them, and that's (supposedly) totally unreasonable. Besides the fact that Intel does not owe De Raadt anything (other software makers pay a hefty sum to be partners, while OpenBSD developers insult anyone who doesn't give them free shit), these bugs are a given in any production process. I don't care if you're Ikea or Exxon or Apple, you don't adopt new shit into your product and not expect shit to break. So his outrage is both presumptuous and facile.