Saddam is playing games:

By first saying that UN weapons inspectors could return with no preconditions, and then rejecting any new UN rules governing the inspectors' work, Mr. Hussein appears to be returning to the old pattern of strategic obfuscation that marked many of his actions both before and after the 1991 Gulf War.

The reason he doesn't want new inspection rules is that by playing a game of brinkmanship with the help of France, China and Russia he was gradually able to water down the old inspection regime so that the final rules of the previous regime made it easy for him to hide things from the inspectors. As long as the old rules are retained the inspectors won't be very effective.