I understand your logic, although I don't necessarily agree with it.
Who was this "competent posek"? And what is the mokor in Shulchon Oruch for this "so called heter"?
I know it's not blanket. That's why I mentioned there were other factors etc
how is his Lifnei Ivair? You are arranging for him to travel on Shabbos.
Where in the Shulchan Oruch does it say there's לפני עוור when its not תרי עברא דנהרא?