How certain are you that another reviewer or the meta reviewer leaked your info? You say that the authors already know you. How can you be sure that they didn't simply guess that it was you? Maybe you mentioned to a colleague that you're an AAAI reviewer and they heard about it. If you both specialize in a niche area and they recognize your writing/argument style, they might have just connected the dots.

I'm just saying that you should be confident in your assessment before you raise accusations against your fellow reviewers.

In my opinion, you need to identify the paper to the chair. The authors violated the anonymity policy. It's the chair's job -- not yours -- to decide whether or not this paper needs to be thrown out.