ARSo,
Nothing wrong. Or not so terrible. The Rebbe z”l wanted a zechus for himself. (He knew he was nebach not living over children.) Though I don’t get the zechus of a siyum on a birthday. I guess he wanted some connection to what he thought was a big mifal he originated. He did not know when his yarhtzeit would be. The siyum Ramban each year should have continued to come out on his b’day. However, one ibbur yohr throws it off.