Because Huck's squat barbell is under his back and connected by his arms, the relative position between the center of gravity of the barbell and the center of gravity of his body changes during the exercise (some people say that Huck's squat is semi-hard pull+semi-squat). The center of gravity of the barbell and the center of gravity of the body in the ordinary barbell squat are relatively coincident, so it can be almost understood that the barbell and the upper body are integrated.
This difference in the relative position of the center of gravity leads to the body's adaptation to different modes. Relatively speaking, Huck's squat can maintain a good squat mode, that is, the pressure on the knee joint during the whole squat process is relatively small. In the case of heavy weight, ordinary barbell squats may cause the body to stretch backwards to compensate.