[chatmasta]

Sure, that might help you on your desktop. But this exploit was only discovered because of a zero-click iOS exploit, where the payload was encoded in an iMessage attachment that opened in Passkit, which rendered the WebP file. (In fact the user didn't even need to "open" the attachment - just receiving the message was sufficient to trigger the exploit.)

So Qubes won't help you everywhere, and the WebP decoder is everywhere.