"He contends that most of the world's ancient and modern leaders are related to these reptilians, including the Merovingian dynasty, the Rothschilds, the Bush family and the British Royal family.[22]"

How do you translate this to being a conspiracy about Jews specifically?

Wow, that is a cherry-picked example if I've ever seen one. The Rothschilds are mentioned exactly once on this page and it's in this sentence:

"He [David Icke] contends that most of the world's ancient and modern leaders are related to these reptilians, including the Merovingian dynasty, the Rothschilds, the Bush family and the British Royal family."

Including the Rothschilds, as well as several other non-Jewish families. The Rothschilds are part of the conspiracy not because they're Jewish, but because they're influential.

I definitely don't blame you for that. Dogwhistles come with that little bit of plausible deniability so it's impossible to draw a hard line on this type of thing.

That's fair and I've sadly noticed it too. I've recently learned what triple brackets mean.

I still see lizard people as like a crazy molemen theory or bigfoot, not Jewish people. I think the response in this thread shows the majority of people, even those quite online, don't see that connotation to it either and bringing attention to it could make it worse.