A few racks or even a couple of dozen racks could be called a datacenter, but nothing on any real scale. Enough to host important and niche things? Sure. I was referring more to like the size of what you might see in Quincy, WA.
According to their site, Pionen has 1.5MW of cooling capacity https://swedendedicated.com/datacenter/
Pionen is small but it is quite a bit bigger than "a couple of dozen racks". More like 100-200 if I recall correctly.