The 33mm tire width is one that I want more clarification on. Out of curiosity I measured some of the tires I had in my garage. The Challenge tubulars - Grifo and Fango - measured what they said they were - 32 and 34. Bummer that it looks like they are enforcing it at the Masters level at nats as well, as most of my tires are 34s and in great shape.
As far as clinchers in my garage, Michelin Mud 2's on a CXP-33 measured at 33.5mm even though they say they are 30s. My older Racing Ralphs that are a claimed 35mm came in at 32.5mm mounted Ksyriums. If they are actually measuring then the Racing Ralphs are legal and the Michelins are not. If they are going by what is on the sidewall the Michelins are legal and the Racing Ralphs are not.
Last night I was helping coach some juniors - all but one of them in the 17/18 class, and all of them doing nationals - it is a local race for us. Some of the juniors are not in a financial position to have lots of tires around, so I need to figure out what tires are legal so they can make a proper buying decision.