“This mirror has been decommissioned and will be taken offline soon.”
has not synched for 947 hours
And it was also very delayed two weeks ago, last time I updated.
Sorry I can’t help to organize a better mirror.
For whoever arranges it: try internode and aarnet.
Here you can see several good mirrors in Aus: https://www.archlinux.org/mirrors/status/#successful
( for some reason I can’t include active links ! )
Its up to the host. Manjaro doesnt control it.
That said … it doesnt mean you get no updates. Just that there (currently) isnt a working mirror in australia.
Theres about 100 other countries thats also true for.
There seems to be some working in Indonesia, Japan, Phillipines, Singapore, Taiwan and Thailand though in the region.
If you would like one in Australia then maybe you know someone who would host it? Like a university? Maybe you would like to do it yourself?