You heard this from R' Weiner yourself? R' Moshe says that Ashkenazim can eat it, why would they argue?
It seems r moshe is not clear on the subject, which is why I believe the kfi never said anything official about it.
P. S. It's not a Kashrus question, it's a side question weather a cut of meat which only sefardim eat, if an ashkenazi can eat when made by a sefardi.