benigmuman has the last word on all this: you cannot retroactively cancel geirus. That, for sure, is the halacha and is supported by the vast majority of teshovus (R”Moshe’s teshuvo nothwithstanding). Regardless whether the ger- at that time- lied- as long as he went through the actual process (milah utevilah) he is a ger. even About Time accetps this!
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