I doubt you care at this point but that is an RMI you are saying is wrong.
And, I shot with the guy I mentioned. He no longer shoots. But he clearly asked about pulling the trigger with a mag in the gun.
Since you are hung up on this, give this some thought. You drop your mag, see a target and shoot it, then insert mag, rack slide and continue on. You just put your finger inside Trigger Guard during reload.
Hopefully that clarifies that the Reloading process can indeed be interrupted.