That list refers to the database ID’s for thegamedb.net API (mainly used for scraping rom data) I’ve ammended the wiki to more accurately reflect what that list is for. The database supports those systems, but retropie may not have all of them installed let alone be able to to run them (like the Wii or Wii U). Colecovision has not yet been added to RetroPie. (plus that list is 3 years old)

The side bar on the wiki is an accurate reflection of what retropie has as part of its setup script. Colecovision is not yet part of it, though I have heard of some people compiling mess and getting Colecovision to work with that, but I haven’t tried it myself.