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Another variable to consider is the squatter settlement that was on the Shum Wan Road mountain. The squatters may have been in such a bad situation that they had no choice but to dump their trash/waste on the streets, which supports eyewitness reports of illegal dumping all over the mountain, which could explain why the drainage system failed.

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The windspeed of the typhoon Helen is rather destructive and might've also been the cause of the Shum Wan Road Landslide. Though I think the landslide cannot happen just because of a typhoons wind, I think it is possible that it might've assisted the other variables to create the landslide.

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Because Typhoon Helen happened around the same month the landslide happened, the rainfall might have caused the landslide to loosen the earth and create a landslide

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A drain is crucial when it comes to prevent landslides as it is really easy for rain water to soak up the ground and increase the chances of a landslide to happen.

HK ads to stop blocking drains:
https://www.youtube.com/watch?v=PNSFBCyIYdQ

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A very possible natural cause is the heavy rain that happened on the day of the landslide. From the evidence file, I found out that the rain might've made the rocks and dirt loosen and tumble down the mountain

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Illegal dumping might've made the surrounding difficult for people like firefighters traverse to stop the landslide.  In addition, the dumping might be piled and washed away into the drains and made incoming water to be stuck.

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Because there wasn't any concrete reinforcement on the mountain, the dirt and rocks were not packed with one another, this made the earth really soft and didn't take too much to create a landslide. If there was concrete reinforcements, the Shum Wan Road Landslide might have been less destructive or might've not happened