Very few electric customers are served by more than one substation, that substation and the distribution wiring between the substation and the customer are going to be a SPOF, except for the few customers with access to multiple substations.

Some substations don't have redundant feeder power either, although that's more often the case where geography makes it difficult (islands/peninsulas)... But the mention of wiring on a bridge might be an indication that is a geographically difficult area of Berlin?

Most infrastructure is fragile and is one step away from going down. It basically can’t operate without the assumption that people won’t mess it up.

A leftist group cannot be sponsored by Russia?

This is exactly how Russia operates inside Europe.

How will 20 year prison sentences get the power back on ("sort this out") ? Do you think 20n man-years of prisoner labor can install a new cable in the blink of an eye? Will the prisoners be forced to build a time machine so someone can go back and thwart their plans? Or how else do you envision this happening?

20 years in prison is what you get for murder and even then only when you also fail your first parole hearing.

Which is a good thing. Few people deserve that long in prison.

sure let’s waste more millions on incarcerating people