Well, yes - any small light source will look like that when you de-focus, especially when you're magnifying it.

A bunch of us often go observing away from urban light-pollution.
From the site we use (a car-park by the side of a reservoir), there's a farm on a hill opposite with a security light.
I've used that light a couple of times to check the scope's alignment after the car drive up there - using the same method in the video above.
And during the day, I've even used the sun, reflected in a ball-bearing positioned at the bottom of my garden.

Any tiny point of light will give the same effect when slightly out of focus - and the effect is routinely used by telescope owners for checking and aligning optics.