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Also, the article fails to state truth; he hasn't actually said that he invested 1% of his capital in Bitcoin. It's just that the value went up high enough to account for 1% of his worth right now. Based on his 'small' investment in Bitcoin it directly points out that it was done to counter the regular economy and the loss of value of his fiat wealth. Smart man he is.
He said he started investing in Bitcoin several years ago but also that he bought a lot more later when the price was around $5,000 - $7,500, so I think he actually invested around 1% of his own capital in Bitcoin, and considering that he has $1.7 billion in his personal fortune, according to Forbes, that's around $17 million, a pretty big money, which a guy like him wouldn't invest without thinking that BTC will rise much higher in the future. He's a smart guy, I agree.
Most investors specially the big ones would always have a doubt first into bitcoin but there were really guys that can see through its potential thats why they do made such decision which as you said its quite a smart thing or move had been done. 1% of his fortune to be invested would be just fine and besides this is the only analysis or price prediction thats somehow realistic yet it do only mention $40k which is reasonable unlike on others saying 60k-120k or even more. lol