The short count is very low, so I don't see shorting as having any influence on the share price. The drop is simply because of lack of detailed news on the pour (tonnage, ounces produced). When details are announced, we will see buying coming in again pretty strongly.
PT would never list on Frankfurt and why even ask? Ever do a simple google search? Just see all them pennies, Siemens, VW, Daimler, Apple, Amazon, Airbus, Fiat Chrysler all ripe for shorting with giant Mexus. Even some funny name Amadeus Fire ( when ready).