How have you come to such a conclusion? I am afraid it isn't right. I found many examples of "I have never been hiking" and two examples of "I have never been hiking in the mountains" and I guess they were from native speakers.
Furthermore, I still don't consider "hiking" here as the present participle of a present perfect continuous tense structure. I think of it as a present perfect structure. I remember I put a comment on a similar sentence in one of your previous threads. There was also a discussion about "been" between engee, fivejedjon and others but I am not sure if they have discussed this point directly.
Student or Learner