Remember we are talking Walmart not a Dollar Store. If Walmart sells some Supertech ATF+4 you can bet their buyers beat the oil companies up to find the one who would sell them the ATF+4 spec'ed product at the cheapest price. Thats the way Walmart works. So I would be 99% confident that it would pass the ATF+4 spec, yes, as Walmart has too much to loose by selling substandard oil or ATF.
Having worked for the retail giant for 8+ years in the past, they are acutely aware of a huge target painted in their chest. (Retail pun not intended.) People, lawyers go after the deepest pockets. WallyWorld would never knowingly sell an out of spec oil. Simply not worth the increased exposure.
Spot on post, Donald.