Itmam E Hujjat And Mirza'S Interpretation
It seems you have not carefully read Ghamidi Sahab’s work or listened to his complete talks. None of his ideas have any roots in Mirza Sahab’s interpretations. The interpretations of Ghamidi sahab on the issues you mentioned are all firmly rooted in Quran, with strong corroboratory evidence from the Scripture. To answer your question: No, the law of itmam e hujjat as explained by Ghamidi sahab is sourced from Quran, it has nothing to do with Mirza Sahab’s ideas. The matter of bigger concern is the divergence of mainstream Sunni and Shia Islam from Quran on these matters, which should actually be probed. Please also note that the right of takfeer of any people claiming to be Muslim has not been delegated to us by God. This practice is a mere display of self-righteous arrogance, and nothing else. It is God alone who will decide their matter on the DoJ, as no one else is the authority on earth to decide such matters after the Prophet PBUH.