It’s the sort of thing there will probably never be hard evidence for, but the circumstantial evidence is in favor of. The symbiosis between HAMAS and the Israeli far-right has been known for years. Here’s an old article on the topic: www.nytimes.com/…/israel-gaza-battles-hamas.html
This is also one of the best things that could have happened for Netanyahu right now, as it props him up in power during a period of wartime and allows him to continue staying out of jail.