I agree with other commenters' definitions of sovereignty. In Australia there are competing sovereignties. An imperial one -- "Australia", conquest, absolute power. And an Indigenous one -- spiritual connection, ancestry, sacred ties. In each of these sovereignties, the word "sovereignty" has a different definition and is deployed for a different purpose.

Indigenous sovereignty existed for 60 millennia, and then the British stole the land and denied that sovereignty in place of their own. The Australian state has the means to enforce its own sovereignty through things like laws, police, prison, disenfranchisement, poverty, but Indigenous sovereignty still exists. This is a fact. If I stole something from you and claimed it as my own with a threat of violence, it'd still be yours, even after thousands of years.

Under Australian sovereignty, you're certainly a citizen. Under Indigenous sovereignty, it's more complicated, and from what I understand Indigenous people have a variety of perspectives. I haven't heard anyone use the term 'guest', but I have heard 'invader'. It's an uncomfortable label, but it's entirely reasonable given the colonial history of Australia. Others have more inviting perspectives on this conflict between sovereignties.

Here's an article about it if you're interested: https://www.smh.com.au/national/what-s-indigenous-sovereignty-and-can-a-voice-extinguish-it-20230113-p5ccdk.html