From the transcript:

By 1988, for the first time, more fast-food orders were taken at a drive-through window than at the restaurant. And this was a problem for the wimpy french fry because by the time you got home from the drive-through, the fries were no good.

[...]

So back then - almost 20, 25 years ago - Lamb Weston invented a coating called Stealth, which was their secret coating that you couldn't see and you couldn't tell was on the french fry, but it lasted - it was crispier longer, up to 12 to 15 minutes.

[...]

But this potato company has a new problem now - delivery. And a 12- to 15-minute lasting Stealth french fry isn't going to cut it because delivery takes longer than a drive-through. The average delivery wait time in a busy city is 20 to 30 minutes because drivers pick up multiple orders and make multiple stops.

[...]

They're starting to pitch these fries to fast food chains now. So they're not in stores yet, but Deb says they could be in a couple months. You won't know it's a crispy on delivery fry just like you don't know when you're eating a stealth fry. You'll just know you had a better french fry delivery experience.

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