@nprofile1q... Quite possibly.
SIM cards in Australia are 100% KYC, and therefore, not private.
Having said that, if Signal is tied to your phone number it is traceable, so unless you are using a 'burner' number, so are you.
The fundamental beauty of a service like Delta Chat is it doesn't require a SIM card to use, so it starts from a non-KYC base already.
Add multi-OS, multi-platform, multi device, de-centralised, multiple relay and fully synced profiles and you are off to a good start IMHO.