Is the USB 3.0 isolator backwards compatible to USB 2.0?

Yes! The USB 3.0 SuperSpeed Isolator is fully compatible to USB 2.0 at Low-Speed, Full-Speed and Hi-Speed. You may use any USB 2.0 A and B connector type cable.

The 3.0 type connectors of the isolator are fully compatible to 2.0 type plugs. You don't require 3.0 cables if the device you intend to connect is USB 2.0.