If you divided it up into vacuum packs and froze it, it could last 40 years.
If you deep freeze it and keep it frozen it will last perhaps a thousand years, like the frozen mammoths.
The bucket is already divided into six vacuum packs of cheese sauce and six packets of macaroni... But they are currently sold out after the publicity from the People article. This is a product meant largely for people who want long term storage of food for emergency situations.
Bags of rice and beans are staples of long term storage, but $90 for some prepackaged mac and cheese in a bucket to keep rodents and insects from getting to it would be good for variety.