While "remote workers are more productive" is in the article's title, I disagree that the author is suggesting that working remotely is a necessary part of the solution. The article's subtitle is "Async isn’t just for remote teams".

I think the post makes it clear to that office workers could benefit a ton from async communication. And I agree completely. Sync communication at my previous job was such a drain on my productivity. For me, Slack made communication easier, but it made focus more difficult and work more stressful.

I think you're right that software tools can make a big difference. The author seems to be promoting its product - Twist - as a great Slack alternative. And I think it looks solid.