Pretty interesting but what exact theory was proven?
The Einstein rings come from his GRT (General Relativity Theory). Rings were first discovered many years ago. The JWST sees these with greater resolution.
Some nits in this colorful video:
1) The use of ”wrapping of space” when it should be “warping of space”.
2) The 1919 eclipse experiment was the third of three “tests“ of his GR, but had great drama, elevating Einstein into public view.