alt Hacker NewsIt absolutely is a slippery slope argument.
"New government mandate paves way for additional government mandate" is about as straightforward a slippery slope argument as you can get.
Slippery slope arguments don't require the eventual fear (e.g. cameras recording you) to be present in the current form, otherwise it wouldn't be a slope.
There are no camera requirements and if cameras are used they are prohibited from using them for the stuff the article implies because the privacy is protected by GDPR. Remember how US corporations really hate EU regulations? Yes that's the regulation preventing them from processing your face even if the system is implemented with a camera.