It provides 6 points of protection, but is Class 2 armor. It's the class and not the actual armor protection that matters for Acrobatics. Why set things up confusingly like this? Because if you get armor made of some other material (like biotech or something) then class 2 armor might provide either more or less than 6 points of protection.
For example, if you had armor made of meat (sounds like it would be from Kingdom of Loathing), Class 2 would provide 4 points of protection. I think biotech class 2 still provides 6 points but it may be 8.
I've tested Acrobatics, and it works fine. You only make an acrobatics roll after failing the first dodge test.