However, modern science adheres to his old theory for some reason, doesn't it? And he didn't "say" it; he scientifically substantiated his theory, if you want to be precise.

There must be some official basis, just like with classical mechanics. Enshi couldn't know everything. Human scientific knowledge about the world at the moment is not accurate and complete. Who knows what other skeletons will surface in the still waters of the STO.
Besides, I already said that the existence of exotic matter has already been experimentally proven, so it's not such heresy. But the possibility of a warp bubble really makes you think. But I think there is a way out.
And what can you say about the expansion of the universe? After a certain point, it begins to expand at superluminal speed.
And this, by the way, is within the framework of General Relativity. Proof.