Does this task have public & private leaderboard?

As described. If so, how many percent of data are public leaderboard based on?

From the overall data description, it says

The dataset has been divided into three splits: train, phase-1 test, and phase-2 test

So it seems that there will be public and private LB. A safe guess is that private will be same size as public, but it would be good to get an official answer from admins.