Interesting…
I had a hunch that Chein’s comments were copied and pasted from somewhere so I did some research and although I did not find a source where he was quoting from, I did find a commenter on a different site, who posted both of Chein’s posts, word for word, a few months ago (Chein’s posts are from three years ago).
While I was checking that out, I saw that someone there linked an article which quoted R’ Shteinman (though I cannot vouch for the accuracy of the report):