The reason I made that assumption is that literally every other time someone pulls a gun on him aside from X2 when he didn't want to cause a shootout with the entire police force and risk the squishy X-Men who couldn't heal getting hurt/killed, he has popped his claws immediately and either outright murdered the guy who drew down on him, or sliced the gun apart to prove a point.
Sliced the shotgun in half in X1, Turned the soldiers into lunch meat in X2 that attacked the mansion, Popped his claws in his hotel room and in the White House/Oval Office kitchen in DoFP, Sliced the guys arm off in Logan, went batsh*t on the Yakuza in the Wolverine, etc.... Guns vs Logan = You're gonna learn. And this time he was like, "Go for it". He didn't even pop his claws until later after whatever it is Deadpool does that really makes him aggro. His "try it and see" is usually him making your gun worthless and then putting his claws at you or in you. He's never just given someone the okay to pull the trigger.