Some ideas:
1. The owner of the 80k bitcoins is Satoshi himself.
2. The owner lost the private keys years ago, and just recently found them.
3. Is it just a coincidence the 8,000 bitcoins lost in the landfill by the owner James Howell is similar
to the number 80,000? Of course its ten times less than 80K but the numbers are similar,
but off by just one zero.
I dont think Satoshi mined any bitcoins that late. He mined lots in 2009 or early 2010 but when he noticed the network was supported to many nodes and miners, he stopped mining, its definately not him. I dont think Satoshi will ever sell any of his mined bitcoins.
Yeah its possible the private keys were lost and recovered however, why move all this money and why send $1B to an OTC exchange, why not sell $1M at first. Seems very strange.
Maybe in a couple weeks we will find out who this exactly is and why he is moving so much BTC.