A shorter would have no issue getting hold of replacement shares to close out their position. Its not as easy as it was when we were listed, but they can just work down the list of holders - start with the biggest non-director and ask if they're interested in offloading. Biggest non-related holder would've probably been LHC Capital, who publicly marked their ISX shares down to 5c each after suspension. Funnily enough, they went radio silent after that. Reasonable chance they were offered 10c by a shorter and no longer have their shares.
SP1 Price at posting:
$1.07 Sentiment: Sell Disclosure: Held