Having an emergency supply of water and canned goods is always a good idea. I’ve read that cans without the pull-ring lids last longer. I don’t know how true that is, but any unbreached can could probably last a decade or more.
Having said that, Kiyosaki always impressed me as kind of a flim-flam man. Maybe he’s looking to buy gold or sell tuna.
Nope. My experience is that they go bad first and a lot sooner.