I feel like you are confusing "physical constraints" with "legal restrictions". No matter the state of the path, one may always try.

Anyway, I went there today. Findings:
- There is actually a third landslide between the Lower Reservoir dam and Lakeview Garden that you can kind of see from aerial imagery.
- The section of the Country Trail east of the eastern landslide is perfectly normal; no difference from a normal hiking trail. No reclamation from nature at all
- There is a rope connecting the eastern and the middle section of the Trail, sort of acting as a handrail. I don't know if you understand, I don't even know how to tag it.
- The middle section of the Trail is significantly more reclaimed by nature, can barely see the way the Trail is going; significant wood overgrow blocking the Trail
- I did not visit the western part of the Trail due to time constraints and exhaustion.
- The vehicular road is normal, just with some gravel near the landslide.
- It only took me 36 minutes to reach the eastern landslide from Tai Wai exit G, and I took a longer path (via Lower Shing Mun Road instead of Sha Tin Height Road) which Graphhopper says will take 50 minutes!

I will make a changeset soon, but probably not today due to tiredness.
I apologise if my previous messages in this thread was too direct/condescending; I was simply dissatisfied with your stubbornness in closing a note without surveying when aerial imagery is clearly insufficient. Imho if I were you I would just leave a comment with my thoughts and wait for someone to survey it, similar to what you did in https://www.openstreetmap.org/note/4756215 , but maybe that's just me.