Lizard, keep it up! By the way, I can somewhat formulate a hypothesis (not my own, I heard it from Keku in the "scientific non-fiction" program; there are many interesting, although unproven, ideas there) that explains movement at superluminal speed. If we take General Relativity (Einstein's, yes, yes, his! So there are no contradictions!), then gravity "distorts" the surrounding space. If we take our spaceship, place a huge mass on its nose, and a huge negative mass on its tail, then the spaceship will create two folds. The front one will shorten the distance from it to the destination point, and the rear one will perform the opposite function. Something like that.

leads to causal paradoxes (such as, for example, an observer sending a signal to their own past).

I did find an error in Wiki. Our professor clearly proved that there is no such paradox in Special Relativity, because by the time the signal reaches its destination, the event will already have happened. Here.

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Large Flying Immaterial Pink Elephants

If your address were "Voronezh," I would definitely say that I know you.

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However, modern science adheres to his old theory, doesn't it? And he didn't "say" it, but scientifically substantiated his theory, if you want to get technical.

Einstein became famous for breaking stereotypes. I'm sure he wouldn't want to create new ones. The theory works as long as we can ignore the error it gives in the case of experimental verification.