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.
I don't think Satoshi will sell his bitcoins, but it would make sense for him to eventually move them
to a more secure bitcoin address, if he is still alive. I have no idea if the 80K are Satoshi's or not,
just thinking out loud.
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.
It doesn't makes sense to move and sell such a huge amount all at once.
But it might make sense to do that if your only goal is to move them out
of their old legacy address, and into a more secure segwit address (without selling).