Those were call center workers answering the telephones.
For the HN crowd, I think a more relevant study would be "knowledge workers" like programmers and engineers collaborating to ship products.
Think of the type evidence that would convince Paul Graham and Sam Altman to yell at all YC2016 founders, "What? You haven't set your up your team as 100% remote?!?! Are you stupid?!?! Why did we give money to you?!? Put the whole team on Skype and VPN access immediately because that's The Competitive Edge you need to beat the competitor from NY-Incubators."