No. That's a set-up, and one that won't work in the NRA's favor.
First, a Republican legislature with a Republican governor instituted concealed-carry in 1987, the first state in the nation to do so. From the beginning, it has always been against the law to conceal-carry in an establishment with a capacity of 50 people or more that serves alcohol. So anybody carrying in Pulse would have been breaking the law.
Also, there was a cop in full uniform in the night club who engaged the shooter right away. What happened to him after that initial encounter is a mystery to me, as I've heard nothing about what he did or didn't do.
I've had a CCL for 22 years here in Texas, and I've never understood those who say they could have stopped something like this in a crowd of 350 people. As it is, it's likely that some of the bullets from the police when they broke into the place hit and killed some of the victims.
Plus, Mateen was shooting at anything that moved. If you weren't out the door or hunkered down, he was going to hit you. Remember, he was very proficient with this weapon, was on the offense and knew what he was going to do. You, with your little 9 mm, would be in full react mode.
The only good guys with guns that were going to stop this guy waited three hours to crash in.
What on earth could anybody from the NRA say to these families that would make them feel better?