Yes, you competely misunderstood.
We were talking about Biden's proposal for "universal background checks" and I was explaining that this would not prevent bad guys from doing illegal deals, using the mythical "Midnight Joe's gun sales" as a metaphor. The thrust of the conversation is that background checks do not prevent criminals from getting guns. Carlson is all over that this morning.
As for selling a gun to someone you know is prohibited, which is what the question was all about as I understood it, and he gets caught in the commission of a crime and that gun traces back to you, you are in big legal trouble, as we saw with that recent case in Seattle involving the guy who sold a gun on-line to a Canadian resident, clearly knowing the sale was illegal. That Canadian subsequently drove back to the great lakes area and murdered his former girlfriend.
If you were listening closely, we discussed how it is LEGAL under existing law, to do a private sale or gifting to someone without a background check. You just can't do the sale to someone you KNOW is prohibited from possessing a firearm.
Now, as I explained to Carlson, if you were listening closely, I did buy a handgun on-line via another forum, from a man in Oregon a couple of years ago. Perfectly legal because we went through FFLs in Oregon and here in Washington. My FFL did the NICS check, I paid for the gun and everyone was squeaky clean.
But the thrust of Carlson's thing this morning is the background check and its inability to prevent bad guys from doing illegal gun transactions.