I have heard about that few times but it is amazing for me that is causing no changes in overall mood on the market and even the price was not shaking that days, so probably maybe this information is fake?
The news is over two months old, but still people here are talking about it like it was today. We did indeed see bitcoin get smashed since that news came out, so who knows if it had an effect. Ultimately it's always hard to tell what's happening when large amounts of bitcoin are being moved, whether it's being sold or someone's just changing wallets. That article doesn't exactly say that any bitcoin was sold on any exchange, just that it was bought from exchanges. If that person sold bitcoin privately, that wouldn't affect the market at all.