chart holding nicely for now, page-12

Can someone who understands better than me explain why the shorts have doubled? Is this still pure delta hedging if so what necessitated such an increase in shorts that happened before the price started to fall? Was it an increase in the traded volume?

I know there are different opinions out there as to whether the shorts are pure delta hedges or related to keeping the share price low for the con-note reset. Will be interesting if it is the latter as now 4.3% (currently) of the stock needs to be bought back to close out the shorts....quite a lot for HZN even at the increased volumes.