Thanks for the "shout out" about my article. Yes, it is quick and easy to administer. Please take time to see the small differences that distinguish the 3 Stages of number sense.
If you want to practice how to evaluate, check the LINCS discussion from 2016:
I posted Google docs of samples (see the discussion). It takes looking at about 50 examples to get a good sense of which Stage an example shows.
If anyone has more questions, feel free to contact me.