Don't get me wrong - I'm sure it works just fine, but there's nothing "magic" about this solution, it's "just" another incarnation of a multi-cell Wi-Fi system (which is the best way to do Wi-Fi) that uses Wi-Fi links for the "backhaul" between the cells (which included "repeaters.) There's probably a fancy management platform - almost certainly an "app" these days.
Enterprise systems have been able to do this practically forever - it's nothing new, but is being pitched into the SOHO market as SOHO users are increasingly finding that "one router in the middle of the house" isn't working for them and they don't want to get the drills out and lay in "proper" cabled backhauls and need as much of the "management" automated as possible.
Bad ad. copy always makes me question the competence of the vendor - either they believe what they say and are "wrong" or they are indulging in massive hyperbole knowing that what they say isn't quite true. Either way isn't exactly confidence inspiring. And I'll mention again, I am rather biased against LinkSys due to past poor experiences. Others may have had better experience.