You're leaving out the cost of owning and powering a chest freezer which is not insignificant.

They're leaving out a lot more than the freezer cost. Not everyone wants frozen meat. Fresh meat tastes better.

There are a lot of other issues with their "buy a cow" idea.

Frozen meat tastes orders of magnitudes better than any of the alternatives

How's that work when you want to use some? Do you have a giant chunk of frozen meat you have to get smaller, more usable pieces from? Do you thaw it enough to cut then put the rest back? I can't picture how this works.

Typically when you buy a large fraction of a cow, the butcher will process it into a bunch of different cuts, I.e. ribeye, flank, chuck, tenderloin, etc. the cuts are usually single-serving, except if you want to keep the tenderloin whole or something. You also get a bunch of hamburger patties or ground beef. Point is, you get all the meat pre-cut before your freeze, so you can use only what you need at any given time.

A freezer costs about 50 bucks a year in electricity (depending on rates, obv). That's a lot less than a half a beef to fill it will cost.