We were talking about baked potatoes left in an oven, not toxins on any form of potatoes or dish made out of potatoes. Your link clearly indicates that it is the mayo that has had its PH raised that is the problem, not the potato. Staph grows on protein rich foods like dairy or meats or eggs. Further, and more to the point at hand, the potato salad would have to be 1) contaminated with live staph organisms, and 2) improperly stored in order for the bacteria to multiply and produce toxin.
This can't happen with a baked potato left in the oven, because the heat would kill the bacteria. Now if you want to assume the potato was contaminated with staph that grew on the potato before it was put in the oven, and thus had toxin on it, then 1) there is no history of staph growing on raw potato, and 2) the potato would have the toxin on it when it was put in the oven, so even eating it immediately would result in food poisoning. So if that is your position, then you would never eat a baked potato.