In other words, "not at all except in the most superficial way imaginable". At best, they're "potato chippy", in the same way that "science-y" relates to "scientific"...
I've never understood the point. I tried them when they first came out (or rather when they went national, apparently, per WIkipedia), partly just for the hell of it (like freeze-dried ice cream and Pop Rocks) and partly figuring there'd be
some reason for their existence at all. Like they'd taste good or something. But they were awful then, and they were just as awful the last time I realized they were still selling them a year or so ago and bought a a small can to see if anything had changed in the 40 or so years since I could remember last eating one. It hadn't.

You might almost just as well eat mashed potato flakes with a spoon, straight out of the package...