Those Dell systems are "not for the general public, and had found their way to the website only inadvertently. The laptops are available only by custom order and only to military, government and intelligence agencies", and the other two have to hack the Management Engine, fighting Intel every step of the way.
That's basically an admission that the ME is a backdoor, and calling ME-free systems something any individual can purchase is farcical or malicious.
https://en.wikipedia.org/wiki/Intel_Management_Engine#Commer...