According to Kenny's linky video they were releasing that thing last year. Perhaps you're right and things didn't quite go to plan on the selling front...
Well, so many possibilities. My natural inclination would be to spread some impermeable substance such as bitumen over the top. Failing that, the area of soiling can be completely removed with a utility knife and the underlay or board etc. sterilised by any appropriate means such as a blowlamp. Of course, for many situations the easiest option would be to simply lock the door of the affected room and abandon it.
Apparently, if you ram a couple of Miracle Slurp-eez up your dog's star asset they have enough capacity to prevent any soiling for several weeks before they need a change.
A Slurpee is a treat sold in 7-11 convenience stores, now with non-immigrant cashiers, made from shaved ice, sugar, artifical color and flavorings. Mostly sugar.