@Peter
Last year I stayed in a very nice hotel in a spa town in the Black Forest. After the trip, I went on TripAdvisor to give the hotel a positive review and found a totally erroneous, bad review by a "Senior Contributor" with over 30 reviews. I flagged the review and told T/A why. The review stayed up. I have flagged it two more times (3 total) and, as of today, they have still not done anything about the error.
The reviewer obviously had the wrong property. They described the location as "... about 20 minutes from Freiburg" ..."located in a small, quiet village just off the Autobahn." According to both ViaMichelin and Google maps, the town is over 2 hours from Freiburg by the fastest route. It's a major resort town, not a quiet village, and it is nowhere near an autobahn.
It's such a pity that TripAdvisor obviously does not care about a veracity of their reviews. This was such a nice place, and I hate to think someone would avoid staying there because of this one false review.
BTW, I booked directly from the hotel and got a package deal including entry to both of the two spas in town. I arrived late the first day and left early the third day, so I only had time to use the main spa in town, but subtracting the regular price of that spa from what I paid, I paid 12% less than what I would have paid using Booking.com.