I’ve never subscribed to that theory at all.
Stalin hated Jews as passionately as Hitler. Some suggest he was willing to let Hitler “take care of his Jewish problem” when the Nazis invaded the Soviet Union. If anything, Stalin used Jews, in the same manner that the Nazis used Jewish Kapos in the Ghettoes.
“Stalin hated Jews as passionately as Hitler”
Stalin hated everyone except himself and this included his Jewish wives. There are reports Stalin’s father was Jewish and it is true that all his wives were Jewish as were his closest henchmen.
That he killed most of them says much about the paranoia of a genocidalist.