It'd be tight , but it could be done
put that 150m of parksway east & west under the stadium then ( a tunnel ) , & it would be on the civic pool site , over parksway & butt up against commonwealth park.
It could be done ...
Where is the money for a tunnel under the stadium going to come from?
We barely got the feds to agree to move the north lanes of Parkes Way roughly a hundred metres south, they're never going to agree to fund a tunnel under the stadium that will cost significantly more.
Even if we could get them to agree to fund a tunnel it's not clear that a tunnel and butting the stadium up against Commonwealth park would even fix the problem, because all the experts so far have said you'd have to eat into Commonwealth park to fit a stadium of reasonable size.
And why go to all that extra expense in both time and resources when you could build the new stadium in literally any of the other city centres, space permitting, and get all the same benefits from building it in Civic? You'd save yourself hundreds of millions of dollars without any major negatives.
In other words your solution isn't realistically feasible, may not actually be a solution at all, and there're cheaper more realistic alternatives.
enough of your " you don't understand "
I simply don't agree with you , that doesn't mean it can't be done ...
You don't disagree with me. You disagree with every city planner, architect, and engineer that has looked at the problem...
This isn't a difference in subjective preference, stop trying to paint it as if it is.