I see what you are saying but you are misunderstanding the point.
There is a buyer of TKO that was looking for 1mm shares. If he were to put in a market order it would spike the price a couple of dollars. Obviously that doesnt make sense, the buyer would be getting a horrible price. If he put a limit order in, in might take three weeks to fill, this stock does not do enough volume for that size.
At the same time, the seller is looking to unload a block. If he were to dump that much stock it would crumble the stock temporarily. Again, a bad price for the seller and a limit order would take weeks.
Instead, the buyer and seller agree to a price and cross. Institutions do this all the time, it prevents crazy market fluctuations.
In this case, you can make the assumption that a buyer either wants to establish or add to a position. He calls around to current large holders and sales traders to see if anyone wants to sell a block to him. They agree on a price and the order gets executed.
