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What he said is that around 10% of his liquid assets are in Bitcoin. And there is a huge difference between total assets and liquid assets. For most of the billionaires, liquid assets represents 1% or less than that of their portfolio. Unfortunately fake news factories such as Coin Telegraph twisted the news and presented it as Mr.Pliego having 10% of his total wealth in the form of BTC.
I tend to agree on the above, total wealth is very different from financial wealth, that is again different from liquidity. Of course the 10% of the above measures can vary greatly, as, as you said, I don’t expect any millionaire leaving their wealth on the deposit account.
Actually the world richest man, Elon Musk, once said he consider himself cash-stripped.