On the official webpage of Aukey stands: "Continue to charge your MacBook or Chromebook Pixel while connected to this hub via USB-C Power Delivery throughput port."
I think the main issue might be the power this device is able to deliver. My Dell XPS13 (9365) complains that the adapter only delivers 25W instead of 30W that it should. So you might not get enough out of it to charge your MBP, especially at 15".