nishtdayngesheft: True, at the time the psak was not on IVF. However, later on, when IVF came around, the Satmar Rebbe at the time ruled that R’ Yoel’s reasoning extended to IVF as well.
A friend of mine who went through IVF told me that he was once at a small event from A TIME. They had a speaker from Satmar there, and he got up and said IVF is assur, and children from it are safek mamzeirim. It did not go over too well!