That said, the major angel for the Tesla project is the local state government of Brandenburg, which is led by the SPD, the party that emerged strongest in the national election. The CDU is also in Brandenburg's gov coalition, but I don't think Laschet's (national CDU candidate) Musk election campaign media stunt had much relation to anything.
We also have a proud history of industrial corruption in Germany (we call it "Klüngel" because that sounds nicer), especially when it comes to public construction projects.
I find it a lot more likely that the failures are the result of a mix of public officials being overly hasty in trying to pave the road (so to speak) and making promises they couldn't deliver on, than that this is entirely down to traditional car manufacturers using their political leverage against Tesla. Especially given the location of the factory.
It's possible the problem isn't so much that regulators are trying to play dirty against Musk but so inept at trying to cut corners to win this "prestige project" that they actually cause overhead by being caught and having to do things again properly.
I'd say generally speaking Tesla's perception in Germany is positive and politicians are more inclined to bend rules in Tesla's favors rather than against. There are just limitations to what you can get away with.