Is seeking supplication or intercession from the deceased major polytheism in itself, or a means leading to it, and does the wording of the fatwa regarding this need modification to clarify that?

We are pleased by the questioner's eagerness to follow the Sunnah and Tawhid, and we find that the statement mentioned in the answer is correct. Sheikh al-Islam Ibn Taymiyyah mentioned that the innovated actions at graves are of several ranks: the first is asking the deceased for a need or seeking help from them, and this is akin to idol worship. The second is believing that supplication at the grave is answered, or that prayer there is superior, and this is among the reprehensible innovations forbidden by the consensus of the imams. The third is asking the owner of the grave to ask Allah for the supplicant, and this is an innovation by the consensus of the imams of the Muslims.