I would have assumed all of the material in the solar system didn't come from our sun?

Other than what's been blown off the sun as solar wind.

I mean, Earth didn't originate from material from the stella explosion of Sol.

All of the material in the Solar System - sun and planets - formed from the same original cloud of atoms. This cloud itself included atoms generated by earlier generations of stars. The different elemental composition of the Sun and planets was partly driven by the physics of processes operating as the system matured.

The sun is a second generation star, that is it formed out of earlier stars who did make those heavier elements.

indeed, and humans are a material part of Earth

Panspermia is an idea, that's a fact. Our sun makes helium. It doesn't even make helium that we use - we get our helium from underground deposits filled by radioactive decay.

unsure what your point is

I think parent's point is that, to an extremely accurate approximation, none of the elements on Earth come from the Sun. Hence, while it's true that trace elements didn't come from the Sun, it's weird to focus on that because nothing else did either.

EDIT: And it's also weird to tie this to the fact that the Sun won't produce elements heavier than iron through normal (i.e. non-nova) fusion late in its life since that has nothing to do with it.

Panspermia isn't widely accepted, but stellar nucleosynthesis/supernovae are generally accepted to be the source of the heavy elements.