Just like the .22 LR conversions for SIG's, the Glock 44 appears to be useful mainly for combat drills. The group sizes shown in the video show it is clearly not a target pistol.
What's needed is a barrel anchored to the frame. My Walther PPK-L will shoot tighter groups than what they're showing for the Glock. Indeed, Walther made a long barreled target version of the PP at one time.