Perhaps, the person "Hal" isn't the only one who handles the address shown above, meaning to say that there's really someone behind the move of this 50BTC.
Looking upon the implication of this activity, I do not find anything wrong or bad as I see it positively, that bitcoin, even though, bitcoins mined 10 years ago, is circulating up until now. No wonder why people should really value bitcoin as it can really be profitable in the long run.
We never know if its the real satoshi it might be someone that is just ready to invest in bitcoin at the beginning of all of this.
"The coins in this transaction were mined in the first month of Bitcoin's existence."
Link
Probably a history that this bitcoin is moved since it was mine just after the launch of bitcoin. Maybe someone that is a real investor of a company has this bitcoin and needed the money because of COVID-19.