In the author's statement, "And in this is a refutation of those similar to the polytheists," do the grave-worshippers fall under this?

Question:
He says: Honorable Shaykh, may Allah grant you success. In the author's (may Allah have mercy on him) commentary on the hadith of the Prophet (peace and blessings be upon him) "The graves are mosques," he said: "And in that is the establishment of the oneness of Allah, and that they should not worship anyone but Him, as a refutation of those similar to the polytheists." Do the grave-worshippers fall under this?

Answer:
Without a doubt, they are included, and the intended meaning is the grave-worshippers. Yes.