So Ki in this sense is physical?
I am unaware of anything that actually exists which is not ultimately physical.
Ki, in the several generations of discussion that have previously occurred here, was offered by the more or less community verified "subject matter experts" as more of a Dumbo's Feather than a measurable phenomenon. This is made particularly obvious as one encounters more and more factually irreconcilable explanations of human anatomy and the tortured use of physics and engineering terminology in even the best formulated verbal and written explanations.
Before the latest iteration of the discussion, however, I could never have imagined the depth to which some people are willing to investigate just how Dumbo's Feather physically enables flight.