It's not that unusual for CSL rosters to be incomplete when first posted. Historically, you just had to post something like 7 names (for an 11 v. 11 roster) by the end of July to get put on the schedule and then you had the rest of the month to fill in names. Some teams would put in a bunch of fake names or double counts just until they could buy time to get their real rosters sorted out before the start of the season. Sometimes, it was just disorganization because you knew the team had enough kids coming to practices.
This is probably worse now because some teams entered their rosters diligently, but others have done nothing to adjust them all summer. Heck, there is at least one team out there right now with a "CHRISTIANO RONALDO" listed on their roster without a jersey number (hey, maybe it's the boys' real name, but I'm guessing not) and it's a team with a 20+ person roster. So, while many teams are likely short players, the more accurate point in time to get a read on the magnitude in the drop in roster sizes would be the night before a real season begins, not right now when there was very little motivation for team managers to get their act together.