Upvote:5
Assuming you are referring to these shuttles http://www.mtr.com.hk/en/customer/services/complom_free_bus.html the answer is probably yes.
I use them frequently and there is no kind of ticket or access control that I'm aware off. You just hop on at the hotel (or the station) and get off wherever you want. You don't need any MTR ticket or any sort of proof that you will use or have used a specific MTR train.