Is it obligatory to repeat the prayers that were performed after the discharge of a brownish discharge (kudra), while forgetting to purify the clothes and perform ablution from it, based on the saying that kudra is not considered anything after purity, especially given the affliction of scrupulosity (waswasah)?

"The brownish discharge (Kudra) after purity is not considered menstruation unless it occurs during the usual period, and it is impure in all cases and invalidates ablution. The prayers performed without ablution because of it are invalid and must be repeated according to the majority of scholars. However, for one who prayed with the impurity of the brownish discharge out of ignorance or forgetfulness, he is not required to repeat what he prayed, according to the soundest opinion of the scholars."