Which would be harder to detect:
whether there is any form of ramping, (current situation)
whether the ramping is beyond a stipulated legal level. (proposed rule)
Hidden software applies equally to both, making it impractical and not cost-effective to catch. Non hidden software, i would say it would be harder to detect the latter.
However this rule is not solely about making enforcement easier (as this example perhaps show) it goes some way to de-incentivise cheating.
The benifits of having illegal software (be it hidden to avoid detection or not) are reduced. In the currrent situation a the rof a players can achieve legally compared to illegally are greatly different. making cheating worth the risk, cost and perhaps conscience.
In the new situation with legal levels of ramping very few people won't be able to achieve the rof cap. Software that allows rof above 15, can easilly be detected (Can they? That is what is claimed, another strand of the argument perhaps) making them to risky to use. And boards that allow the ramp to kick in at lower rate-of-trigger-pulls, aren't neccesary as very few people won't be able to achieve this anyway, and those that can't aren' likely to be playing at the level where the there is such an incentive to cheat.