We’re not in a courtroom and mods are not bound by precedent. However, if there are other instances, I wouldn’t be aware of them. I’ve not paid a lot of attention to moderating until fairly recently.
Here’s a link to the specific rules for P&E.
With those in mind, I think the onus is on you to explain why we’d be precluded from issuing multiple warnings if we feel circumstances warrant it. I will allow that such circumstances are – and hopefully will always remain – rare.