are all hdmi cables 2.0?
It's important to remember, there's no such thing as HDMI cable "versions." There's no such thing as a "HDMI 2.0 cable." The version numbers refer to the HDMI connections in your gear. Which is to say, your TV can have HDMI 2.0 inputs, but your HDMI cable is just an HDMI cable. Any High-speed will do.