are you sure?
over on cdf it was translated as average 4.5km/hr speed.
And I'm pretty sure one doesn't need a powered exoskeleton to carry a 35kg rucksack...
I remember the video from zhuhai showing an earlier prototype where the demonstrator said they could carry at least 100kg.
You are correct. The slide does in fact say the walking speed is an average, not top speed. My Chinese is rather rudimentary.
However, I'm pretty sure about the weight-carrying capacity. If you notice, the photos show two distinct models of exoskeletons, one of which has a further, more robust-appearing variant. My guess is that the 50kg handling capacity only applies to one of the models/variants; there could well be a model/variant with a much higher carrying/handling capacity.
A further thought: it'd be really cool if the exoskeleton has a further option of being directly plugged in to an external power source, such as a diesel generator on the back of a SPH, which can significantly increase the lifting capacity for performing ammo resupply whilst also recharging the battery.