You are lying.
You don’t need a gun safety class to purchase a firearm. The state of Nevada does not have any licensing requirements to purchase a firearm. Every FFL dealer is subject to federal ATF compliance with a form 4473 + NICS check.
Edit: I have a Texas LTC (license to carry). We moved to constitutional carry years back, but one of the perks of maintaining a State LTC is that my FFL doesn’t have to call in a NICS check when I present my LTC. I just fill out the 4473, he makes copies of my DL and LTC, and I’m done. I’m guessing every state that issues a license to carry must be the same, but that’s how it works in Texas.