It's primarily because of the poor quality of the Honda parts drawing. The drawing of the undertray/engine shield looks nothing like the actual part and so it is unclear which fastener is the correct one.
In addition, neither of the dealers I visited had this part in stock, so they couldn't...
^^^ This. There is absolutely no reason a 2016 LX should be low on oil, unless an error was made during your last oil change. This has nothing to do with your car not starting but is a more worrying issue.
If you own a stick you should know how to hold the car on a hill momentarily with your left foot alone.
From my LX I would gladly ditch the back-up camera, brake hold, electric parking brake, econ mode, and auto-climate control