Yosi7:
Your comparison of Rabbi Schneerson to the Satmar Rav is a non-starter.
Rav Schach and others said what they did about Rabbi Schneerson and/or his movement/faith but none said anything negative about the Satmar Rav (yes, including any potential and minor differences in the matter of Zionism). On the contrary, the Brisker Rav, who was quite medakdek in mitzvos, to say the least, was mechabed the Satmar Rav.
So it was Rav Schach along with other gedolim speaking about Rabbi Schneerson, not milk5.