Edited for correction, I got the air flow direction mixed up on the rear tail rotor.
I am surprised how close the drone had to have been to the starboard side window in order to hit that stabilizer where it did. Looking at the top, the main rotor is going clockwise, so to counter that, the rear rotor is pulling air from the port side to starboard (right), which would blow the drone away from the stabilizer, additionally, airflow would be traveling along the curvature of the body and would tend to pull things in towards the rear part of the helicopter, so I would think that the drone flew right past the passenger side window very closely in order to hit the horizontal stabilizer where it did. They are so lucky it didn’t come in through the windshield, it wasn’t very far away if anything.
Overall, it’s an interesting problem with aerodynamics and physics looking at how the “probable” drone hit it.