Sorry, but I don't see the button. I can see the new thread button, and I would imagine it uses the same info as the other button.
I have no plug ins, however, my work computer is restricted and I am not able to view most images. I will check at home.
Is the Review button some sort of an image?
As for the name of the poster, I assume Sarfa33, an administrator, moved the post into the 2 reviews posted on the Hyatt forum. It is possible it's a real review though
ETA: I just looked on the Hilton forum and went back to the Expert Hotels Review forum. I can see the button on the Expert Hotels forum but not in Hilton or Hyatt. So it can't be a plug in, I think