Again I can't tell if this is a joke but just in case:

Electricity did exist... One of the fundamental forces of the Universe is electromegnetism, and we've known and been able to see (and sometimes feel) lightning - pure electricity. It's a tangible thing we just took time to understand and control.

What's tangible about Qi? Nothing. And even if we put that aside, an old man with a stick is not a scientific approach to 'prove' anything.