YT channels that do: those Israelis are all fake because they're European, those are not "the real Jews", are deeply antisemitic and ignorant of anything jewish and they like to keep it that way. Once more for the entire chevre:

ANYONE can BECOME jewish. It's not an ethnic religion. And indeed many people converted, e.g. in Europe in Roman times and in the Middle Ages and in Central Asia and Kavkaz in the 8th century. And today too there is a steady stream of converts. Read the talmud and you'll soon notice the presence of Sages who were either converts themselves or the children of converts.

Genes have nothing to with being Jewish: that judaism is genetic is an antisemitic notion, that sadly, is also entertained by the Israeli government.