From Nirvana's site:
K2 is a long-time reliable Dutch commercial strain because of it being a bit easier to cultivate than the white strains.
*I* didn't say it wasn't a white strain. I quoted a reputable seed breeder.
I did exactly as you suggested and Googled it. Of the replies, with the exception of one, each said clearly that it is easier to grow then WHITE STRAINS. Several did say that the strain is related to White Widow, but in the same paragraph, each also said what I quoted above.
Obviously there is some disagreement about what this strain is. By far, the wording of it's description is that it is NOT a white strain, only related to a white strain.