You have confused 'daily shorts', i.e. new shorts, with 'total...

You have confused 'daily shorts', i.e. new shorts, with 'total short interest'. To protect the guilty Total Shorts are only published with a four business day time lag. Total short interest has been steady in the last few days and is still just under 4% of shares.
Sounds high but many stocks go for long periods of time with higher. Metcash MTS short interest has been above 5% for more than three years but the price has been in a rising trend for all of that time. And looking on the bright side, over 96% of MGX shares are still long.
As for running out of cash, I say again that the latest Half Yearly shows that MGX has an undrawn credit facility of $100 million. I don't expect that to be used but nothing unusual if part or most of it is. Many companies borrow to achieve their aims.