“Obviously, no one should posken based on this. Especially since it may be a minority opinion or it may not be a valid opinion at all.”
Lol, and not because it is an article that you: think you read around 30 years ago that you vaguely remember, in which you think there were opinions that allow
That isnt the preffered way to posken?
Seriously though R’ Moshe allows yichud with children adopted at young age http://www.hebrewbooks.org/pdfpager.aspx?req=14678&st=&pgnum=122
As DoesThe Tzitz Eliezer, And I believe R’ Ovadia as well