You use coordinate and analytic interchangeably but coordinate system is not a requirement nor equivalent to analytic geometry. It doesn’t even relate to mathematical analysis. Analysis, to the extent that it’s series and limits, also existed in India before Descartes.

Herons formula doesn’t count because it’s the end result. Not a means to an end. You don’t need to go to Heron for that. Area of a square also has a formula and that would have made your point.

Using trigonometric identities to derive area of cyclic quadrilateral is different as algebraic equations are means and not the end.

Again, analytic literally doesn’t mean “coordinate”. It only usually does.

Also it wasn’t a wall of text to obfuscate. I sincerely laid out the full argument the best I could. Half the wall is Wikipedia quotes. The other half was itemized to make it easy to parse. But sure whatever floats your boat mate.