I think September was a mistake and was written in because...

I think September was a  mistake and was written in because that's when Australian companies typically pay dividends. Perhaps the writers of the prospectus 'corporate consultants' had communication errors. The company also states on their website. Again this is all speculation.

"
KEY INVESTMENT HIGHLIGHTS on ASX Listing

The Company expects to pay a dividend of 25% NPAT for the calendar year ended 31 December 2013!

"