No, it did not. The gun-free mall was a neighboring property. There are no Walmart stores located in malls.
Might research that some more.
According to ABC News, El Paso law enforcement officials advise that, moments before his killing rampage, the shooter cased the Walmart “looking for Mexicans.” While that may be so, it is nevertheless true that, consistent with his “manifesto,” his recon was also calculated to make sure that he would be attacking in a low-security area. In that regard, the Walmart store had no armed security guard, no police presence, and was located in a shopping mall that was a self-proclaimed “gun-free zone.”
Yes it was located in a mall that was a gun free zone.