So this guy has no clue what he’s rambling about; the two probation cases were only granted probation because it was arguable that the defendants had been misled by the state law regardless of the state law’s invalidity. That doesn’t mean all cases go that way, but they were the first ones.
Secondly, he even mentions interstate commerce but immediately stops to argue that instead it’s about generally limiting freedoms. We’re a country with inordinate amounts of gun violence, and saying “it’s for kansas only” does not mitigate the fact that guns made in kansas would inherently end up out of state. That’s why interstate commerce still applies.
Third, the comparison to pot is significantly misleading. Pot has a lot of support on both sides of the political spectrum and the general public, something which no-background purchases of firearms does not in addition to one being simply substance which only affects ones’ self in the same way alcohol does and the other which is a larger source of actual violent crime.
More states doing it doesn’t make it somehow legal. People are still arrested related to pot from states that have legalised it, and the every state law attempt to evade federal regulation of firearms has been universally struck down in courts.
It sounds like you’re advertising a crime here.