Yes, SpaceTime is a fallacy of the mind, but a wonderful fallacy of the mind.

The framework of Spacetime can be used to calculate outcomes, and in that sense it is correct. But it does not declare the truth underlying the outcomes.

Why?

Because Einstein did not incorporate the motion placed on the material outcome caused by the Big Bang event. He failed to incorporate the most important motion matter is involved in.

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Understanding what Spinoza did can help you understand what Einstein did.

'Spinoza and Einstein'

https://medium.com/@fred-rick/spinoza-and-einstein-000bd112d947