They apparently knew it was to happen on that day, as Berhalter and Artur got a nice picture in, in Brazil.
The loan is for a year. The Columbus Crew will have a similar situation as they had with Cristian Martinez, where if Artur is worthwhile they can sign him permanently in December 2017.
In the meantime the Columbus Crew SC will pay his entire salary and give Sao Paulo FC everything from what has been considered "a small" to "considerable" allocation of funds for the loan transfer.
Link that had considerable details on deal from Lance.br and was backed up by ESPN Brazil and copied in several other articles in Brazil.