AAQ, it seems that the type of learning you mention is agreed by all here to be fine. It is pretty obvious from the fact that Chazal specify teaching your daughter, that they weren’t trying to outlaw anyone from picking up a Sefer, בהצנע לכת.
There is the incident with Rebbe Eliezer, but that isn’t quoted as a broad rule, nor is it clear what exactly he meant.
The issue in question is about standardizing such learning.