Of course officially, this is not it's own land and is part of Frontierland... All I am trying to say is, I think it's quite common for people to use a non-official term... (There are no rides at WDW only attractions)
Disney for 70 years as primed it's fans to take a theme of an area and stick a word in front of "land" for naming an area.
Disney has spent the last 13ish years telling us that a new plot of land themed to a single IP is it's own distinct thing and it's own land. (Cars land, Pandora, TSL, SWGE, Avengers Campus, TSL (shanghi), Zootopia Land, World of Frozen, Avengers Campus (HKDL), Avengers Campus (DAW), and soon Frozen Kingdom (DAW).)
I think this is the first time in Disney history that 2 rides are themed to the same IP opening at the same time and is not called it a "land". However, by most definitions from the past 13 years... its a new land even if Disney doesn't want to call it that.
Anyway, if there is a big consensus, I will stop calling it cars land, even though it really seems silly to me not to call it that.