I don't see what postmortems have anything to do with individual accountability. individual accountability means the ability to do your job, it has nothing to do with things going wrong. literally performing your job means having individual accountability.

so yeah it's pretty dang clear it's a joke. same for code ownership, tasks for testing or refactoring, design and architecture reviews. The joke is that it's stuff that people love to hate on and then it gets increasingly more ridiculous until it's stuff that you most definitely want to hire for doing/having.