Hello,
in 2.0, PointCloud class has been replaced by TiePoints class. I suggest you look at Python API reference manual where in Change Log chapter you have following:
• Renamed DataSource.PointCloudData enum value to DataSource.TiePointsData
• Renamed DataSource.DenseCloudData enum value to DataSource.PointCloudData
• Renamed PointCloud class to TiePoints
• Renamed DenseCloud class to PointCloud