I believe that is inaccurate.
You need five weeks to campaign. So even if a GE (and therefore parliamentary recess) was called tomorrow, that would bring it up to Oct 31st.
Then you have the Queen's speech to start a new parliamentary session, a 6 day debate on the Queen's speech and then a vote on that Queen's speech that the parliament has confidence in this new government. Assuming that there isn't a hung parliament which would add extra days before the Queen's speech as a coalition or confidence and supply deal needs to be worked out.
BBI45 and Brekkie gave kudos