Construction planned on the Temple Mount

Let me preface this story by saying that I'm not sure how 'indisputable' it is that any part of the Temple Mount is "indisputably not within the areas that require immersion and other preparations (i.e. ashes of a properly sacrificed red heifer), according to Jewish law." Many Rabbis and most Orthodox Jews (including - as far as I know - the entire ultra-Orthodox community) take the position