Most of that stuff originated from early DOJO!!! incarnations, not the Wiki itself, which just documented them. The practice of doing pre-fabricated screenshots was very common back then, Coin Matches, Battle Cards, Adventure Mode, stuff that never got implemented made use of this, but there was stuff that actually got in despite the pre-fabricated shots like Jungle Hijinx or Saturn Valley (one shot in particular from that last one infamously included Bowser before a formal announcement was made).