NBA.com staffers, and not the 76ers, update the team's roster page that appears on Sixers.com. This is an important distinction - because the Sixers and their web team are very good at helping you get to know their players. They'll make you love Furkan Aldemir, keep you updated on all the international prospects with their transatlantic tracker, get a vine of Betsy Ross doing the Nae Nae, and work well to excite people about the team.
Meanwhile, the NBA would probably rather you forget the team exists, or at the very least make you turn away from it.