The test linked to is very inaccurate and very limited. The tire with the lowest traction rating is studdABLE, not studded. Generally, studdable tires do not have the special winter rubber compound of studless winter tires, and performs like a summer tire with M&S rating. Somewhere far down in the text, there is a reference to the Winterforce being studded, but the specs do not confirm this.
Up here in the Scandinavian snow countries, there's a big tire test every year, done in the north of Finland, and the studless tires do not normally perform better
on ice than studded ones, except for, occationally, some very bad/cheap studded are worse than the good studless. Especially on wet ice, there is nothing that beats studs. On cold snow (>10 deg below freezing), the soft studless ones are normally better than studded.
There is one problem with studded tires and modern cars tho', and that is the anti spin and ABS systems. Studs do have a little slip, and that makes those systems kick in. With studded on ice or hard snow, you actually get shorter stopping distance without the ABS activated (as you do on loose gravel), and there's a similar effect on the TRAC, or whatever the anti spin is named.
All that said, I still prefer studless, because many of the main roads have no snow or ice most of the winter, and when there is ice, I just adapt the speed to the conditions (like always), and I have the benefit of great performance most of the time, and less noise. (sh!t what a long sentence...)