I'm not having a go at you as it's obscure local politics that I wouldn't expect you to be versed in, but you haven't got the sightless clue what you're talking about.
The way things have worked in Canberra more or less since self governance in 89 is the ACT government pays the AIS (Australian Sports Commission owned, i.e. federal body) to lease their facilities, namely Bruce Stadium and the AIS Arena among others.
That worked out alright for a while until priorities changed at the national level and federal governments starting cutting the Sports Commission's funding and support for the AIS after the 2000 Olympics. After that point maintaining and upgrading the AIS wasn't considered to be in the national interest, so the facilities have effectively been left to rot by the Commonwealth.
So what has happened for the last roughly 15 years is the Sports Commission has, for the most part, refused to pay for maintenance or upgrades of the facilities, saying that it wasn't a priority and that the ACT could pay for it themselves if they insisted the maintenance and upgrades happen, whilst also refusing to sell the facilities to the ACT.
That has effectively left the ACT in the position of being forced to pay for the maintenance and necessary upgrades of facilities that they are leasing from the AIS, whilst also making it incredibly difficult to build our own facilities elsewhere because we've been forced to invest hundreds of millions of dollars into facilities we don't own over the course of 30 years, which we can't now recoup some of the losses from through selling them because we don't own them.
That brings us to today, where the Albanese government has shown an interest in reinvesting into the AIS, and the arena and stadium by extension, but is looking for local support for the project. The local support is there for the upgrades to the facilities, because we desperately need them, but the ACT government doesn't want to be locked into the same catch 22 as before where we're expected to fund the maintenance of culturally significant facilities that we don't own simply because there's a change of priorities at the federal level.
That's what's happening, the ACT's concerns are totally reasonable, and they'd be mugs to financially support upgrades to Bruce unless it's placed into their ownership or a timeline to the ACT taking over ownership in the future is created.