Not only that (Germany’s debt), the Germans are eventually going to have a revolt of their own if they keep trying to prop up the rest of the EU.
That’s a power play. Any loans that Germany gives out come at the cost of the borrower’s national sovereignty; those are part of the terms of such loans. Why else did the countries that took the loans resist them at first, and then get their governments replaced (suddenly) with politicians that were receptive to the loans?