Ill add the link where the information can be seen:
https://assetdash.com/, bitcoin currently holding the 10th position on the list by MarketCap, after escalating five positions just this month alone.
Recently Buffet declared that:
Cryptocurrencies basically have no value and they dont produce anything.
Whatever
Warren buffet only invests in companies not commodities. e.g. he would say exactly the same about gold, silver, corn, orange concentrate, tin, potash or even Baltic sea index futures.
With this comments he means that cryptos are out of his investing universe because they do not have a balance, cash-flow, taxes, shares, etc... that his team can analyse. It does not mean that they are worthless.
Bitcoin is not generated by a company as he may understand the term, however there is a mining community, so arguably, WB could invest in a Bitcoin farm as he could potentially invest in a gold mining company as these are companies - not that any of this sound likely.
Regardless hes irrelevant either way.
Believe me, WB is anything but irrelevant when it comes to big money.
Your comment is right in other matters, he personally could have Bitcoin, as he could have diamonds or gold or silver, but that would not be an "investment" from his point of view.