Is Rabbi Shimon Weiser one of those nonjew jews?

Rabbi Shimon Weiser:

— “Dear Moshe. According to our sages, war for us is not a game but a vital necessity and only by this standard must we decide how to wage it. On the one hand we seem to learn that if a Jew murders a Gentile he is regarded as a murderer though no court has the right to punish him.

But we find in the very same authorities saying: ‘The best of Gentiles - kill him; the best of snakes - dash out its brains.’ According to Tosafot, though during peace time it is forbidden to kill Gentiles, in a case that occurs in wartime, it is a mitzvah [religious duty] to kill them.

According to Tractate Sanhedrin, all Gentiles during wartime are to be presumed to have evil intent. And thus the rule ‘Whoever comes to kill you, kill him first’ is to be applied. This is the rule of ‘purity of weapons’ according to Halakah. (Body of Jewish Law.)” —