No, Steven, we haven't discussed it at all. I have merely referred to what was posted here, which addresses the meaning of "strain at" without mentioning the option of "strain out" as I recall. But nobody answered me until now. All I read was what somebody posted.

If he makes a comment somewhere about the choice of "at" over "out" that should have been the first -- and probably only -- thing quoted from him. It might have saved a lot of useless speculation.