Why would it not be allowed? It's relevant to pinball and doesn't violate any of the site's rules? If you don't like them and don't want to read about them don't click on a post that has them listed in the title. I can't think of a single other Pinball product that is as polarizing as these are, it's weird how some people react to the mere mention of them.

No it's not, it's a new member posting about something that has been covered many times in other threads. This happens regularly and if it were about ColoDMD or some other topic people would let it slide. The way I see it is you have three options when this happens; you can suspect he's somehow a shill or a fake account to promote a product, you can ignore it entirely or you can "Be Nice!" and inform them they should use the search feature and post in one of the many threads that already exist on the topic.