"Jewish people named me as the general of Israel’s hackers.", "If they appear again, I again come to save Israel." - I would say that this guy is highly delusional or this is some cheap way of trolling people supporting Israel.
I've seen the exact same sentiment, mentality, and actions from just about every politically-motivated "group" (using that word very loosely here) on the face of the planet. I've seen Saudi hackers deface websites with Quran thinking that somehow this'll make Islam more popular, and "Zionist" hackers deface websites with degrading pictures of Palestinians thinking that would champion their beliefs.