I'd like to point out that that opinion was prefaced with "as far as I'm concerned" meaning it's no skin off my nose what they do with it.
Semantics perhaps, but what you said was:
'As owners, as far as I am concerned, they can do what they like with it'
not
'As owners, as far as I am concerned, they
should be able to do what they like with it'
The latter is an opinion and I'm fine with that although I don't agree with you. The former is factually inaccurate as they either can or they cannot do what they like with Uluru - your opinion on the matter is irrelevant to the fact of the scope of what they can do as owners in the real world. And as the 'own' a world heritage site, they can, in fact, do very little with Uluru. And, in my opinion, quite rightly too.