I consider it to be of immense potential importance. If these bacteriophages turn to to have influence on some very serious diseases, this finding could be as important as the discovery of bacteria and virus. On the other hand, my understanding of the topic may be seriously misunderstood. Anybody with a better understanding than me are invited to explain it better:)
I am certainly not an expert in this area. I suggest that you first read around the topic, and get some background. Start with the first 2 links below.
There is work on connecting bacteriophages and Parkinson's disease. See the last link below.
Letters to the editor of research journals are often short research articles, and well referenced. The amount of refereeing that took place is unknown. It provides the editor the opportunity for researchers to give a contrary viewpoint. Examples abound. See the link.