Rabbi Nachum Eisenstein is making a point and I totally agree:
For many decades, Rabbi Eisenstein has been fighting false rabbis and false converts to Judaism. Mainly false converts to Orthodox Judaism, as Reform converts are not considered Jewish in the eyes of Orthodox Jews.
The Rabbi also fights against false or corrupt Orthodox rabbis selling conversion certificates to Gentiles. For instance, when a Jew wants to marry a non – Jewish girl. The Jew wants his future wife to be Jewish but she doesn’t want to undergo a difficult conversion process. So the Jew decides to buy a certificate. This happens a lot. Especially when the deal is made outside of Israel.