It is possible for a company to "hide" on Transport Reviews. However, it requires that 100% of the customer reviews be removed from the site. Only the person that submitted the review may remove the review, so it makes this very difficult.
However, if all reviews were removed from the site your company would fall into an inactive state on the site. This means that your company WOULD be on the site, but it would not be found in the rankings or directories.
Most reports on Transport Reviews are based on one or two years of data. After two years without reviews your company will more-or-less be in an inactive state where you will not show up in reports or the directory by name.
However, the company remains on the site, it is just harder to find them.