These researchers found that if you work from home you will be less efficient and productive than people who from their office. Can we say the same about freelance workers? Do you think that if workers are given the chance to "own" a task like freelancers they'll be more productive because it is just like being self-employed where you treat it as your business and not with the mindset of another man's business?
To be honest, this all just depends on one's mood, whether working at the office or at home when the mood is bad everything will get messy. As for efficiency, in my opinion, it makes sense if this research certainly refers to the context of social interaction that occurs in the workplace environment which drives it in a positive direction, but for someone who is a loner, this situation will greatly interfere with his work productivity. So 2 different conditions will create different environments, all have levels of mutual influence on each other. Working at home, we have control over time, managing who can enter the workspace, while in the office we are involved in a lot of interactions that can occasionally be annoying. It all comes back to one's mood and cannot be generalized evenly.