Its been a while since I last went into a deep dive about this, but i think the term did exist before. Black pepper, other spices, as well as ginger or garlic can add "heat" to a dish without chili peppers.
I don't mean "heat" in the ayurvedic sense, I just mean in terms of the burning sensation on the palate.
I'm not sure Hindi does either though? Garam is certainly ambiguous.
In Italian it's "piccante" which comes from archaic "piccare" "to sting". And to me, chili pepper sting and punch more than give me a feeling of heat
Also, chillis lose some heat with cooking. Again: From Thai cooking, fresh chillis are used sparingly as a topping, but Bird's Eye chillis can be used in a stir fry enough to kill a small child (joke, but they can use a lot).