The source refers to retail electricity prices and thus doesn't apply here. The German electricity price is subject to lots of different taxes and fees; energy generation makes up less than a quarter of it [1]. These taxes do not need to exist and even the "EEG" which subsidizes renewables could be paid via the general budget. Like, for example, power plants could be paid for by the state. The comparison of household prices therefore makes little sense, as it implies the governments are in a race to offer the lowest rates to its population.
So according to your logic, taxes used to subsidize electricity production should not be included when calculating the cost of electricity, which can only give rise to a meaningless cost. Germany imposes such high taxes because they have such massive subsidies for producers. That is why electricity costs so much more in Germany — because it costs so much more to produce. But being fungible, the cost of wholesale electricity on the transnational exchanges will of course tend to the law of one price. It is the taxes that bring this in line with reality as to the fully loaded cost of generation, which in Germany is much higher.
>Germany imposes such high taxes because they have such massive subsidies for producers.
Even without the EEG, the electricity price would be among the highest in all of Europe. Also, given how much public money coal for example receives in Germany, I think it is a very reasonable argument that the EEG subsidy should not really be considered a fixed part of the electricity price that could not be moved elsewhere.
[1]: https://strom-report.de/medien/strompreis-deutschland-2021.j...