This seems like an overly broad sword to cut with though - an explicit assumption that working in the office is by definition more productive than working remot

This seems like an overly broad sword to cut with though - an explicit assumption that working in the office is by definition more productive than working remote. Employees can be unproductive in the office just as much as remote employees can be super-productive at home. Yahoo just seems to be taking the easiest to see metric for "productive".