similar, but this was years before, maybe 2011 or 12.

that guy on mt gox was putting up walls of tens or hundreds of thousands of coins. all gone in one buy.

if you're interested the bearwhale has returned - https://www.reddit.com/r/Bitcoin/comments/6d2tp1/i_am_the_bearwhale_uasf_now/

but in his case he intentionally wanted to sell all at once. he wasn't eaten up by buyers. pretty stupid move but he still got millions of dollars.