“Did you know that the Satmar Rav held IVF was 100% assur, and that children that result from it might be mamzeirim?
The Satmar Rebbe’s machlokes with R Moshe was regarding artificial insemination. IVF had never been done by that time. And they are somewhat different. In addition, The Satmar Rebbe never said the children would be a mamzer. Perhaps he said a safek or koruv, but it was never a definite.
Thos who hold this a get meusah hold that she is an eishes ish and therefore it is not the same safek.