I find that particular research important for three reasons.
1. The 10 fold difference was consistently demonstrated many times.
2. Their research was conducted with professional programmers, in their workplace.
3. They were able to estimate the impact of a number of different factors, and they found that the single biggest impacts were workplace factors. (Ambient noise, dedicated office space, availability of white boards, etc.)
Admittedly they are unable to tease out why the connection exists between the workplace and productivity. Do productive programmers choose good workplaces? Or do good workplaces make programmers more productive? Probably a bit of both.
BUT if you're an employer, go read that book. Then consider your office plan. It is a lot easier to pay for a good workplace for an effective small team than to pay for a less effective larger team. Office space is probably not where you want to scrimp.
Edit: https://news.ycombinator.com/item?id=1995716. It sounds mean and accusatory to say on an internet message board that they made stuff up. But actually, our brief exchange was charming. He said it with a twinkle in his eye.