Syag,
I am not familiar w/ R Tendler’s declarations that are “against Torah”. I am not fully familiar with all he said and did over years, I read some of his science-related work and it was reasonable. He was R Moshe’s s-i-l and not put in herem by him, as far as I know. A quick search shows that R Reuven Feinstein spoke at R Tendler’s levaya. All of this just has to give you a pause before proceeding, but I see no acknowledgement.
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