It was almost surely fired in a machine rest for the test, so the operator may not have even been looking down the barrel. No need for scope or sights, just clamp it in, pull the trigger and operate the bolt.
I've heard nothing but good things about CZ, so I doubt you will be disappointed. I have a couple of rifles that are very capable of half inch groups (with handloads, one is a .204 in fact) although some days I just can't shoot that well. Enjoy!