As usual the anti-gun people have to lie to make their case. Fortunately for us lying isn’t enough to win anymore.

The artist is almost for certain referring to the Tiahrt Amendment. Here is what Wikipedia says about it:

… the Tiahrt Amendment, which prohibits the Bureau of Alcohol, Tobacco, Firearms and Explosives
(BATFE) from releasing information from its firearms trace database to
anyone other than a law enforcement agency or prosecutor in connection
with a criminal investigation. Additionally, any data so released is
inadmissible in a civil lawsuit^. Some groups, including the Mayors Against Illegal Guns Coalition,
believe that having further access to the BATFE database would help
municipal police departments track down sellers of illegal guns and curb
crime. These groups are trying to undo the Tiahrt Amendment. Conversely, the Tiahrt Amendment is supported by the Fraternal Order of Police, as it allows municipal police departments full access to BATFE trace data in any criminal investigation.