this is old news
it was talked about a few days ago with a similar thing.. whereby coins that were generated in 2009. were spent into exchanges like mtgox and the stash in mtgox from 2013 is now moving due to the bankruptcy administration..
whales are people holding 100k plus. like M.saylor, or other entities that OWN their stash..
this however is not a whale, but a shark.. and also its a mtgox stash. thus not an individual owner but a small part of mtgox total hoard stuck in bankruptcy administration
this event is not a sell-off. its just a re-organisation of the mtgox stash ready to pass out to creditors in the future (moving from cold to hot wallets so to speak)
Even though it was old news, and the answer was true was a pile of MT.gox who was reorganizing and aimed to return the funds to the creditor, I did not care whether it was a shark or the pope but I hoped that the person who was harmed by MT.gox at that time they could Getting compensation in the future, hopefully this will come true.
This is make many speculative, and does not know the direction of why the wallet lives after 10 years of not active, there are people who say that the wallet is the result of a hacking, the discovery of the missing phrase, the investment aimed at 10 years, only the usual activity to renew the wallet and is a reoraganitation of MTGOX accumulation and many more, but it is true that the speculation about this affects market sentiments, whether bitcoin will be sold to the market or not, which might give a little fear for many investor.