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In the Name of God بسم الله
The Straight Path reacted to Islamic Salvation in Ghulu: The Case of Mughira the Sorcerer
Indeed they were.
However, these words are spoken by a proto-Sunni Hadith narrator called al-A’mash. This indicates that the `Aimma and their true followers were not doing La’n openly and that Mughira betrayed Taqiyya.
The Straight Path reacted to Islamic Salvation in Reliable Narration: Wilaya and Thaqalayn
I don't think that they are qualified to speak about Shi'i Hadith. They likely limited themselves to popular works of Hadith like al-Kafi [which have accessible gradings] and did not conduct an exhaustive search.
In any case, the Hadith in the OP is enough to disprove their claim, seeing as though it is a reliable version of Hadith al-Ghadir apart from the one they quote. Even if you do not accept the Wathaqa of Abu Tufayl and Hudhayfa b. Asid [the only controversial narrators in the chain], it does not matter one bit because Abu Ja`far عليه السلام confirms it, making it authentic by our standards.
قال معروف بن خربوذ: فعرضت هذا الكلام على أبي جعفر عليه السلام فقال: صدق أبوالطفيل رحمه الله هذا الكلام وجدناه في كتاب علي عليه السلام وعرفناه
Ma`ruf b. Kharrabudh said: I relayed these words to Abi Ja`far عليه السلام so he said: Abu Tufayl has spoken the truth - may Allah have mercy on him - we have found this speech in the book of Ali and do recognize it.
The chain to Ma`ruf b. Kharrabudh is undisputed.
On top of this, the purport of the Hadith comes in so many alternative reports that it can be claimed to be Mutawatir in meaning, at which point individual chains lose over-riding significance.