Honestly, I don't think anyone could have held bitcoin for the past 14 years without being tempted by bitcoin's multi-million percent growth without selling a single bitcoin.
I believe that man/woman have more wallets than we know and they have sold them many times over the years, and this could be considered their biggest sale as well as on the market.
Or maybe he just had a huge net worth in other assets: real estate, stocks, commodities, etc. What's clear is that someone who's poor and struggling to make ends meet couldn't have held out that long without selling anything. But as for his other wealth, if he had other bitcoins we don't know about or other types of assets, we can only guess.