I can't imagine how can someone be holding this much Bitcoin for so many years. When you have 80K Bitcoin and the price of the coin reaches 20K USD in 2027 or 70K USD in 2021, you'll at least sell one Bitcoin and spend that year very nicely. I believe that someone accidentally discovered keys or they had a wallet and lost the last 2-3 words and cracked it via brute force. If there really is someone out there who holds Bitcoin for 14 years, doesn't sell single coin and doesn't even think about to sell the coin when the price is at its peak to later buy more, then this man deserves The Nobel Prize for his patience.
Another scenario is why don't you think this person owns multiple wallets and he has more bitcoins than we think. As we have seen over the past 16 years and in every bull cycle, there are always some big wallets that wake up and a lot of bitcoins are sold. So is it possible that these wallets belong to the same owner? I don't rule out that possibility.
Indeed, it is very difficult for someone to hold bitcoin for years without selling any bitcoin while the price of bitcoin has increased millions of times.