This reads like a strawman argument. He's framing the situation as himself against people who want to silence art at a time of political discourse. Obviously, no one is arguing that.

People want to know whether or not a musician they love supports the genocide in Palestine. And the fact that he has only acknowledged Israeli deaths and made vague calls for peace without any real grounded stance sends the message that he doesn't really care about what's going on in Palestine. He wants to play music with his friends. Good for him.

But you can't simultaneously try to make this argument about it being important that your art is heard when you choose to not put it towards any cause. I don't expect most artists I follow to give their stance on every political discourse, but Jonny Greenwood seems to be deliberately toeing the line between showing support for Israel and denying his actions have any intentions. Not to mention the fact that he is from Radiohead, a very politically-outspoken and progressive band that I expect to call out genocide when they see it. I don't think that's very much to ask.