That's a big amount, but not big enough to create a strong impact to Btc's price.
Though there are thousand of addresses in that platform that holds more than a thousand Btc and I understand such movement is really noticeable, but it's not something to be worried of. The only question remains is, what would be the primary purpose for transferring such amount from a personal wallet to an exchange.
And I'm pretty sure it's not because of this :
maybe he's just securing his money in a big exchange for fear of a problem with his wallet address,
Personal wallets are always more secure than any exchange.