I agree it is hit or miss. You could most likely get away with the belts being expired if they are not too far out of date,and plead ignorance on the expiration date. They have checked the belts the last few times I ran a friends car there in 2020/2021. (The typical Pro / Super Pro type car.)
Back in 2010 or so, they checked everything, and I mean everything @ Monster Mopar. Pissed off quite a few racers. A lot of it was due to the 'holier than thou' attitude of the kid doing tech. I about got escorted off the property due to questioning his knowledge.
With that said, my wife's Barracuda runs low 11s, but looks stock at a glance, so they just write numbers on the window and I'm on my way. Been that way since 2007.