I'm pretty skeptical of this methodology. They don't seem to be making any attempt to measure whether a job can be done effectively from home, only whether it's prohibited by some physical necessity. "Managers, educators, and those working in computers, finance, and law are largely able to work from home", but is having your teacher or lawyer on a little iPad really a complete substitute for having them right in front of you?

I guess I'm not sure how I would do it better, but that doesn't make it super meaningful.