With so many different processes to create graphene, each type yields different qualities of graphene. I could not find any information on the quality of this dry ice method.
Like anything, the cheapest or easiest way to manufacture something always wins out in the end. I am sure we have not seen the last of the NIU process.
I look forward to seeing what they can do with this easy to make Graphene material. Even if not pure, there could be some applications where they can just use the structure to filter materials or trap specific elements.