https://www.wdwmagic.com/attractions/cars-land-magic-kingdom/news/09nov2024-disney-reveals-trackless-all-terrain-ride-system-for-new-cars-attraction-at-d23-brazil.htm
I think its still up in the air, or a misinterpretation by the site you quote, as a trackless ride still follows a track (like racetrack).
Shoes is a keyword. Sellers will put it in there to draw more views of their product and broaden the selection presented to the buyer, even if they arent shoes. Waterproof oversocks might be a decent option too.
Did you not look very hard? I found many options with a simple google search.
OMGear Water Socks Neoprene Socks Beach Booties 3mm 5mm Anti-Slip Wetsuit Footwear Fin Swim Sand Proof Socks https://a.co/d/5yDRc7P