The referred bill is the one mentioned in this page.
I ask this question because I don’t understand the following: if Boris Johnson is truly determined to leave the EU without a deal, why can’t he just ignore the bill and do nothing until October 31 approaches. Then regardless what the British parliament wants, the UK will leave the EU anyway.
If my logic is right, then why is the media describing the news as a big deal and why is Johnson worried? If my logic is false, then I welcome any corrections.