I clicked on the link and closed it after 3 lines. No. JUST no. I will not stand for those columns. You have KILOMETERS of virtual space on a webpage. You are not stuck on a physical dead media. Don't pretend to be.
Try reading it. it is strangely archaic but it's an easy read for me, and well, what's more important, the format or the subject?
None of the links I found mention font/line spacing though it's a quick skim so far.
Your point about having to scroll up and down is spot on; it happens that full page fits comfortably onto my screen so I didn't need to. I forgot it wouldn't on others. If I may add to that, the link to the intercept others had to point out to me I missed because it blended in too well with the rest of the text.
Anyway, that's 1/2 hour reading set for this evening, thanks!