OMG , this guy is a Liar and fraudster. But he dare to say we are lie to him while him did not even place the order.
I just checked, other seller already reported this guy,they already make details explanation, just search this guys ebay ID on this site to find out more.
Like other seller says, this guy will aim for your listing items with variations.
As all people knows, for listing items with variations. If buyer did not choose any item in the menu,ebay shows the price of cheapest item. when the cheapest item out of stock, it will still shows that price as default,until buyer choose one of the item in the menu. That is the way how ebay Present this kind of listing，

if you are a new seller on ebay，do not let this guy take a advantage of you，do not show waken to his treat. He will say that since the listing no longer able to choose the item as default price shows, you are lying and ebay will block you,and ask for money to exchange for "Not report you to ebay". Do not believe him,that is not your fault at all. ebay would protect you.

If he has not contact you before,block him in advance will save your time on communicate and explain to this asshole,you can directly ignore his message,since he already been blocked by you, that would prevent him insists to buy something from you and making other excuses to threat you.

This person is disgusting. Obviously, he was blackmailing seller ，but he is saying that seller were lying to him. Obviously, he is threatening seller. when seller say no to him, he say that seller are threatening him.