I don't really understand the point you're trying to make, I don't see anywhere in the post nor the title claiming the purpose changed and the title is directly related to the content. In fact, it seems like you are just agreeing with the post.

I think people can get frustrated at CI when it fails, so they're explaining that that's the whole purpose of it and why it's is a actually good thing.

I would personally actually frame it slightly different than the author. Non-flaky CI errors: your code failed CI. Flaky CI errors: CI failed. Just to be clear, that's more precise but would never catch on because people would simplify "your code failed CI" to "CI failed" over time, but I don't thing that changes it from being an interesting way to frame.