I suspect this is the beginning of reform. Politics moves slowly. At least my translation of the article implied that further steps towards decriminalization will come in the future.
In the US, states often pass laws that undermine federal laws. I'm less familiar with EU and German politics.
I always wonder how we as a society could legalize "hard" drugs. Do we sell them like alcohol / tobacco, with minimal restrictions? (Just age limits.) Or, do we require obtaining a license, or only allow taking hard drugs in a controlled setting? I don't have the answer; but it's an important discussion to have as drugs are decriminalized and legalized.