Someone explain to me slowly how mk live home circuit has a rainbow road plzkthx

Someone explain to me slowly how mk live home circuit has a rainbow road plzkthx
Mario Kart Live is a toy-based game that doesn’t have actual tracks though so there has to be an extra rainbow road in there somewhere - maybe the list is counting the two remake rainbow roads from MK8?
e: apparently there are tracks? I’m not sure how that works with the toy part
i mean theres also the arcade mario kart games idk if they have original rainbow roads and obviously they arent accessible to the general population if they do but a gaming youtuber might go out of their way to find/play it
idk much about bandy but hes nintendo focused and relatively popular, isnt he? like, "youtube as a primary source of income" popular?