Maybe this wall is real? He wants to sell his coins but he doesn't want to kill bitcoin with dumps.
Satoshi, Tim Draper, Winklevoss twins, Ethereum?
The wall is very real (when it's up)
Seems like the behaviour of a lone whale deciding to get out. prolly mined them all on a laptop.
Any org like ethereum would probably get out in a more sedate manner, trying to stay under the radar.
such as the guy who sold a pizza for +10,000 BTC. They are numerous.
But one thing is sure, the price will fall quickly if this wall is not removed in the next hours.