Why there is no harmony in ancient Chinese music

While many experts and scholars say that ancient Chinese music "was inhibited by the system of development, only suitable for solo performance, no ancient people in-depth study and so on". But you see the explanation for harmony is that two or more different tones sound at the same time according to a certain law and constitute a sound combination. So according to this statement, I think there was harmony in ancient Chinese music. Could it be that no one struck a chime while playing the zither, no one played a blowjob while playing the zither, and no one played a drum while playing a blowjob? Haha, the last one is a bit of a stretch, but we're not ancient people after all, and who knows if people ever played like that?