i don't think the point was to come up with an exact number of gun laws. the point was to show that the 20,000 figure often claimed by the pro-gun side is very doubtful. but the total number of gun laws may not tell us a whole lot. 100 cities could pass laws to require waiting periods. that would count as 100 gun laws. or the federal government could pass one law to require a waiting period throughout the nation. it would count as one law but would have more of an effect than 100 separate city laws.
and your point was demonstrated to be specious using your own source. to contain strawmen even as you claimed it to be a strawman.
This example is sarc.