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.