Well, at least they did not assign one star to it, which would have made it worse. Most people try to reference the source of the recipe, but in many instances it's not known - maybe your mom gave you the recipe, or a friend, or you found it on another site. I've seen recipes published in cookbooks that were taken without acknowledgment from another cookbook - saw one just this week in a book I picked up from the library. The comments aren't nasty, just factual (arguably so, anyway), although I am amazed that this person has enough time in their life to do all of this. And the last one was almost two years ago, so perhaps they are bored.
Equally annoying are the political correctness reviews - this is not a German recipe, it's Austrian or whatever - get a life, you really think recipes pay attention to borders? Basic food stuffs are the same, especially if you think of farm communities, and many cultures can come up with the same or similar dishes..... Someone criticized my recipe for grits as being something no Southerner would make - well, there is a reason the South lost the war

I made no such claim, it's my recipe and I like it that way.
So while annoying, it's at least not harmful - no single star to downgrade rating for reasons that have nothing to do with the recipe itself.