Actually I don't know any people in the field. I am just an amateur geologist (<-- actually it's chemistry again XD). But I start to find some local books about hiking or Hong Kong geology cited this crater hypothesis, as well as internet (as it can be a really eye catching title).
Yet, there is another hypothesis (published on 2007) that saying it is not a crater but a revived caldera.
The former one seems more common, at least i had came across to it randomly couple times