Plenty of shots get deflected and find their way into goal. You can just as easily say a shot that goes untouched past a few defenders is lucky too, but they are all a part of the game. He also had the assist on Origi's winner against Newcastle, and a key pass to Robertson to set up a goal against Huddersfield.
The only point I want to make is that Shaqiri has performed pretty well in limited minutes this year. He's not at the same level as Mane, Firmino, or Salah, but he's helped Liverpool keep getting points when they've called on him. If Liverpool sign Depay for a decent fee and he can do the same, he will be a success as well.