The website of the German federal tax office is not GDPR-compliant: https://twitter.com/jdvhouten/status/1488481039630704644 Seems premature to sanction private businesses when EU governments have not yet been able to come fully into compliance. Perhaps the changeover is more difficult than anticipated? As others allude below, it might make sense for the relevant EU-based alternatives to come online/scale up.
That the private fine is essentially a token throwaway amount reflects that the court isn’t trying to throw the book at them; one can imagine the court will be much more upset about the government instance you highlight if it remains unaddressed.