[tacitusarc]

No, that is most likely mold. Not all white spots are positive, especially if they are on old cheese in the fridge (as per the article).

[stevenwoo]

It does give a method of testing at home at the end, though, with hard being crystal and soft being mold.

[GuB-42]

Even if it is mold, just remove it off the surface. It doesn't penetrate far on hard cheeses like Gouda.

Also the reason why I don't buy pre-grated cheese, it doesn't age well. It also tends to be lower quality to begin with.