Nesmith is a solid 3pt shooter. I wouldn't necessarily call his overall performance "lucky" (sure, maybe a couple of his makes were "lucky"). Shooters like him just periodically have themselves a night like the one he had last night. Nothing about that is luck. When a shooter is rolling, a shooter is rolling, and any shot they take just goes in.
If Nesmith were nowhere close to being a 3pt shooter, I'd agree that there was a lot of luck, but the dude's actually a solid 3pt shooter.