Secondly, could this wallet belong to a mixer/exchange?
Not, is not.
The transaction was sent to a deposit address and then the fund removes again to some address same as the other 490 transactions and not moving for more than 1000 days. If that was for exchange, the fund will move into the main wallet address exchange and you will see a million transactions on that addres.
Also, some address exchange from a popular exchange is marked with name as well.