Two things I noticed.
1) There has been a run of 5 star reviews (some noting how perfect everything is at Hedo...)
Friends got back from Hedo last week and indicated that room and other problems still existed frustrating some guests. They said they had a decent trip themselves, but other guests that they spent time with had the typical room problems and runarounds involving the Front Desk, Maintenance, etc.
These same friends were encouraged by a Hedo employee to write a positive trip report for Tripadvisor.com. They decided not to write a review because it would not have been fully positive and they felt pressured to write one emphasizing just the positive attributes of their stay. Perhaps there have been other recent guests with similar experiences and views feeling it's best to just not write a review on anything but a "perfect" trip?
Roy, give it time. A combination of positive and negative reviews will again be finding their way back on to the Tripadvisor.com website.