DY,
1. Borokovski was compelled to go through a gerut by his father-in-law, who had info that could have gotten him in trouble with the law, after marrying his wife in a church ceremony. There is no record of them having ever had a Jewish wedding. He continued to go to church and did not know where one puts tefillin and could not even complete the first verses of “Lecha Dodi” and “Shema Yisrael”. Interestingly, Chareidi dayanim today are quick to invalidate conversions simply because the rabbanim who performed the conversions are not part of their group.
2. Your comment about Rav Shlomo Zalman Auerbach and Rav Moshe is hotzaat shem ra.