I have used these in pubs and other venues plenty of times.
You scan your phone and can then put a false name in the form if you want.
It accepts whatever name you put in.
You can put Mickey Mouse in there if you want.
The details you put in do not go to the venue.
All you do is show them the screen that comes up after you submit your details that just has today's date on it.
I have never received an SMS.
The only time you would get a SMS would be if there was an outbreak at that venue, which is not gonna happen as covid in NSW is pretty much at zero and non existant,.
Even if you got an SMS it just goes to your phone and only you see it.
You shouldn't be showing your phone to anyone else anyway, certainly not your wife.