What a frustrating article. There was an interesting bug here. It's trivial to explain. It's not a zero-day, this was fixed months before disclosure. Most of the article is basically: "Imagine you were running software with horrific security holes behind this WAF. We even made some examples. It had a flaw. If your entire security posture depended on this WAF, imagine how much damage could have been done. Imagine if AI were involved!"