That's a big number of address and too much to hold if its only one person. There might be a group of people who continues to work, or the worst thing is that those are scammers address which is very common for them to have more bitcoin addresses. I don't have 1BTC as of now but I do only have 3 BTC address just to make sure my money is safe but never to make a hundred of addresses, its hard to manage honestly.
Did you even read OP? He's saying that each of these addresses contains 1 BTC in it, at no point does he say that a single person owns all of these addresses.
Fun fact, owning 1 BTC is equivalent to owning around 700 acres of land in terms of rarity.