1. This scene was NOT cut in 2001, the unedited and edited version aired interchangeably from 2001 to 2004 (small chance of 2005). Below are a few recordings from different years of the scene, all of which have a screenbug to estimate their airing.
2. The scene was NOT removed due to 9/11, but instead "Standards and Practices does not care for gags involving petrol and matches." as confirmed in a tweet by Vincent Waller (a crew member for the show):