I say, and with God's success: It is not correct; because the endorsement of ijtihad (jurisprudential reasoning) is not invalidated by a similar one except in the case of the qibla (direction of prayer); because it can be shifted to another direction through ijtihad; as it is a religious matter, and impurity is a physical matter that cannot be made pure through ijtihad due to the necessity of repeating the prayer if impurity appears after ijtihad in clothing and utensils. Therefore, whenever we consider a garment pure through ijtihad out of necessity, it is not permissible to consider it impure through a similar ijtihad, thus invalidating every prayer performed with what was initially deemed impure, while the prayer is valid with what was deemed pure. See: Maraqi al-Falah, pp. 34-35, and God knows best.