It has to do with AI because:

> Another line of reasoning is that with more fake CP it is more difficult to research the real CP hunt down the perpetrators and consequently save children.

(own quote)

Yes, the predators existed before AI, but also:

> I think the reasoning is that the AI contributes to more offenders (edited).

(own quote, edited)

To be clear, I don't think this line of reasoning is entirely convincing, but apparently some people do.