The idea is that there is methods to figuring out how much a company really worths, not the worth that the stock market gives it but the real worth because companies do have data to show that, from the revenue to profit to cash on hand to debt and many others, so you can make a calculation on what you think the company worths, and use that to see if the company is actually going for that or under or over, if you see an undervalued company you buy it.
Moreover, Warren mixed that with companies that he thought would basically be always relevant, like Cocacola or Gillette or Washington post and the likes, because they would basically be always around. None of this could be applied to bitcoin.
You want to know how tough he is? Dude has been friends with Bill Gates for decades, they have been playing bridge together for decades, they hang out all the time, Warren gave 30+ billion dollars to Bill's charity, basically all around BFF situation, Warren doesn't own a single Microsoft share, but he owns a lot of Apple shares.
If you do your trading with that much machinery mind and only look at the numbers and never trade anything you do not understand, eventually there will be some that actually you can understand and put 2 and 2 together to realize its undervalued and you can buy it.