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how is general relativity related to any prior experience of the 1920s?

Trains and clocks, mostly!

that is special relatively , not general

The maths that underpin GR were developed before Einstein. Without the maths you have no ontology, no way to evaluate the truth of a scientific claim.

https://en.wikipedia.org/wiki/Tullio_Levi-Civita

the math doesn't prove anything. we didn't get experimental results until decades later

> Didn't Hume already prove we cannot invent anything not related to our prior experience (which ultimate goes to the universe's natural laws we experience).

Do you mind elaborating on this, or pointing to some resources where I can read more?

The map is not the territory. It was always an abstraction.