I think it's a hybrid because of the orange-brownish mottling on the flanks that is visible in the 2nd photo. Pure Black-throated should, I think, show greyish streaking.
Mui Shue Hang is the park along the banks of the Lam Tsuen River 5 minutes walk from Tai Wo station at Shui Wai Village. You cross the bridge over the river and turn right into the park. The bird is anywhere on the left in the leaf litter or thicker vegetation between the entrance to the park and the turn to Mui Shue Hang Village. There are Grey-backed & Japanese Thrushes in the same area.