Bear,
You are ignoring my argument and the halacha. Yes, if it was clear AT THAT TIME that person didn’t mean it when they verbally accepted ol malchus shomayim, then it is not a good geirus. However, if it was so clear we can assume an Orthodox Rabbi would not have done the geirus.
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And we certainly don’t say that if a person is over aveiros after their geirus, then the geirus is batel l’maphraya. You are just ignoring the principle of dvarim sh’belev aynam dvarim. If a person was “conning” a well-meaning rav, then the con is on them because after 120 they will have to face Judgment as a Jew who is michuyiv in 613 Mitzvos.
As for the person you refer to at the end, he was properly migayer and was frum for years. The fact that he has gone off now (although he claims he is still a maiman) does not retroactively annul his geirus, it doesn’t mean he wasn’t sincere at the time, and even if he wasn’t sincere he is still a Jew because dvarim sh’blev aynom dvarim!