Because that truck is just a cross-country truck without adaptation to mouning the gun. See the red line, that is the top of the chassis. It is straight and flat. The gun (axis of the rotation mount) is mounted above it. The gun is so far from the ground the they need a tall ladder for soldiers in the video. That also demands a much longer arm for the loader to lift the shell from the ground. The longer the arm, the weaker (relative to actuator) and susceptible to vibration it is.
The mount is so high that in case of battle damage of the loader, soliders have to carry the shell and walk the ladder then lift the shell over shoulder to load. I don't think the Indian army would accept such product.
I have to call this thing closer to the work a pickup-truck mounted machine gun than something for a serious army.
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compared to SH-15, see how low the mount is. It can be operated manually when the autoloader is damaged in battle. Worth to note, the Chinese truck's suspension is adjustable to further lower the whole chassis in firing position. That is something the Indian can not do yet.
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