“Teams had half as many workstations as they had engineers.”
Yes, that's how pairing works: two people, one keyboard, one workstation. Having done this for a while, I wholeheartedly agree with everything the author says. It's great for software quality and productivity (among other things, it's much harder to slack on HN), but it's also incredibly draining and definitely not for everybody.
And management have to provide a workstation for each worker; you pair at a pairing workstation, but everyone needs their own machine for stuff like email, Slack, and reading the news over lunch.
Bring a notebook, and record the work you are doing with your pair. You will need that information for the next-morning's SCRUM.