This is one of the weirdest assertions that I ever encounter.
There is no tie in whatsoever between the idol in the OT and the Blessed Virgin Mary aside from the title. That is no problem any more than the title King of Kings for Christ Himself. Unless of course one is willing to assert that that title is also heretical since it was used in the OT for idolatrous kings.
Ezra 7:12 Artaxerxes king of kings to Esdras the priest, the most learned scribe of the law of the God of heaven, greeting.
Ezechiel 26:7 For thus saith the Lord God: Behold I will bring against Tyre Nabuchodonosor king of Babylon, the king of kings, from the north, with horses, and chariots, and horsemen, and companies, and much people.
Daniel 2:37 Thou art a king of kings: and the God of heaven hath given thee a kingdom, and strength, and power, and glory:
2nd Machabees 13:4 But the King of kings stirred up the mind of Antiochus against the sinner, and upon Lysias suggesting that he was the cause of all the evils, he commanded (as the custom is with them) that he should be apprehended and put to death in the same place.
1st Timothy 6:15 Which in his times he shall shew who is the Blessed and only Mighty, the King of kings, and Lord of lords;
Revelation 17:14 These shall fight with the Lamb, and the Lamb shall overcome them, because he is Lord of lords, and King of kings, and they that are with him
Revelation 19:16 And he hath on his garment, and on his thigh written: KING OF KINGS, AND LORD OF LORDS.