It's a lot more than two atoms, and all the various experiments leading up to them being weaponisable gave us all the info we need[0]. If we didn't know how the sun worked, the bombs wouldn't bang.

This by itself should be enough to pass the test of:

>> Have we experimentally recreated a sun and verified any of the theoretical models we have?

in the affirmative.

I mean, it's not like science requires 1:1 scale models.

> (or gravity for that matter)

Neither cheese, which is a similar non-sequitur.

[0] Including the fun fact that the sun is a "cold" fusion reactor, in the sense that it's primarily driven by quantum mechanical rather than high-energy ("thermo-nuclear") effects.

I'm not sure if this was first noted before or after the muon-catalysed fusion research.

Physics: the only place where someone looks at ten million K and goes "huh, that's cold".