Has it? it looks like someone posted the link, and a bunch of random people with no real information (who dont work at google) said "I dont believe it.."
They just pointed out a bunch of SEO problems with the site, that doesn't proof or disprove that they have been censored. Especially if their ranking only dropped on specific terms and it dropped suddenly.
I don't have any particular say on this issue in particular, but what about the fact that Google can silently remove replies without telling you (which gives the image of non-bias) and further that people may be biased in favour of Google without actually being affiliated with Google?