I understand that this is one anecdote, but I've seen enough similar cases of misapplied filtering to take it seriously.
Beyond that, and as a counter-anecdote, I have read hundreds (if not thousands!) of filtered reviews over the past year and in my experience they are more likely to be fake. Furthermore, one implication of challenging our assumption is that you are suggesting consumers would be better off reading, and basing their decisions on filtered reviews since -- by your assumption -- they are more likely to be genuine. As I said, I cannot offer proof, but given what I have seen I believe the filter to be more likely to catch a fake review than a real review.
From what I can tell, all 3 reviews were kosher. Unfortunately because yelp incorrectly filtered the two 5-star reviews, the restaurant has an unfounded poor reputation on yelp. I left a 5-star review, and as far as I can see my review isn't filtered (at least, not when I view it). Perhaps that is because I'm a long-time yelp user.