This is definitely where we disagree.

You are still defining supply as somebody's demand (willingness to pay) for a coin.

I think supply is how much of a coin is in existence.

By definition, a trade always occurs at the point where willingness to sell = willingness to buy. Which is two say, a trade occurs where demand is equal. Therefore a trade does not change demand.

All other points on the curves are completely hypothetical and does not exist. I'm not arguing price can't change, nor that demand can't. I'm saying a trade does not change these things. (I am still contending that the supply of a coin does not change unless the protocol changes and allows more or fewer coins to exist, or if someone provably burns coins).

I regret that we cannot come to agreement on this point. Nevertheless, I appreciate the time you've devoted to our discussion.