Like another poster pointed out, if an article whole premise is addressing terminology, it’s strange that they call something like a PowerEdge T320 a workstation. It’s not, the whole poweredge line is servers, although this one is a tower rather than rack mount.

I’m not a fan of having very strict labels for things like that, If you use a server as a workstation fine ! If your workload can run on a Mac mini you can call it your workstation as well if you wish!