I don't think this applies to BitCoin.
Also you left something out (that I consider important). Buffet* and Graham was talking about investing.
It I remember correctly, Buffet said that you should be able to explain what your investment does in simple terms.
Without going into the weeds, you can do that with BitCoin. If someone can grasp (generally) what a credit card does, then they can understand BitCoin.
Even if you are getting BitCoin to invest only, it is still easy to understand. In this case, I would say it is even easier to understand because you would not need to know about GPUs, Blocks, hashing etc.
* For those who may not know (and don't want to look it up), Buffet was at one time the 2nd most richest person in the world (under Bill Gates).
You mean according to Forbes I assume. A lot of money out there doesn't want to be publicly acknowledged.