I tend to think this is a material breach
It is. The insistance that Iraq not interfere in any way whatsoever with the requests for out of country interviews, complete with the evacuation of the entire family of the interview subject, was made very specific in the resolution. Blix may have a list of key scientists gleaned from an inspector. As it's a good bet that Iraq won't put them on the "available" list this will force the inspectors to demand someone not listed (I'm being optomistic here). The inspectors will insist and meet armed intimidation. This will be the trigger to remove the inspectors. Everything's meticulously timed, IMHO.