UK data shows vaccinated people are drastically more likely to get it and spread it than the unvaccinated. In other countries VE drops to zero after only about 6-8 months, but the UK programme was ahead of other countries. Raw VE in the UK has kept going down after reaching zero and is currently deeply negative, with it being worse than negative 100% in some age groups. In other words, vaccinated people - for whatever reason - are far more of a problem from an infection control perspective than the unvaccinated.
The public health authorities don't have a good explanation for this and have been reduced to blaming a vague, highly speculative and sometimes unnamed set of confounders, for which they insist everyone make massive adjustments despite not being able to provide any evidence that these confounders are important or even exist at all. And in fact one study in California that did do a lot of these adjustments found they made very little impact (a few percent at most). That's an issue because public health's "adjustments" are now reaching absurd levels, e.g. taking AZ from 4% effectiveness to 73% VE!
It's very unlikely that Austrians are biologically totally different to British people, so we can say with 100% certainty that this latest quasi-Nazi move is going unlikely to have any effect on their case numbers, although we can also say that having taken the leap into such darkness the authorities there will never admit to any type of failure, thus the unvaccinated will continue to be blamed even as the data falls apart around them.