Ben Levi,
That post was a copy of an article. The article was clearly written by someone who was not clear on the requirements of Geirus. The psak of R’Elyashiv, at least as quoted in that article, is not a contradiction to Rabbi Druckman and certainly does not mean that R’Elyashiv holds that the Geirim that went through Rabbi Druckman are not Jewish, chas v’shalom.
The article is, frankly, mere hearsay without the response of the accused party, a known Talmid Chacham.
Rabbi Druckman is no “clown rabbi” he is a posek. Once someone is a posek, a talmid chacham sh’higiya l’horaah, he has a right to argue, and he must argue on even those greater than him. Ain l’dayan ella ma sheinav ra’os.
R’Moshe argues on the Vilna Goan, the Noda BeYehuda, even sometimes the Shulchan Aruch or the Rama. See the introduction to the first volume of Igros Moshe.