We have seen ChatGPT confidently answers to satisfy the question you asked.

I am sure if you asked the tool about Christianity and Islam it would confidently answer the same.

Though the reality is both those religions came a few hundred / thousand years after the Bhagavad Gita.

When your question has an agenda the tool satisfies it.

It's catering to your worldview. If it's narrow minded. You get the answers to satisfy you.

You seem to have asked it about nothing except castes. Nothing about Karma, duty, purpose of life, right and wrong etc. That says something.