I believe that that is the case but there have been debates about it before as to whether the center plays the guy under the basket or directly in the middle. In my opinion however you shouldn't play 1-3-1 but instead go with 3-2. 1-3-1 provides the other team with many more offensive rebounds and a lot more inside shots that they make... maybe its just me though.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs