I think the upshot of this anyway is not to worry about it - just run the DS2500s and enjoy the improved braking performance all round.
I have posted on this several times before.. searchy will find it.
Yes DS2500's are performance pads, classed as Race on the box.
Reg90 is a ******** reg from EU, meant to stop poor performing pads from being sold as equivalents to OE spec... which makes sense. What they did was apply a 15% of OE friction coefficient, but then cocked it up by not just making it within 15% of OE on the negative side, but made it +/-15% of OE. this then makes "BETTER" performing pads outside of reg 90 because they perform better.
functionally they work far better than stock, and this is why so many people want to run them.
If you were concerned about the pad in the event of a serious (fatal) road crash, then I can imagine the scenario of the car being taken to bits to determin the cause. Too good a brake pad would'nt likely be one of them, nor identifying every component on the car against every standard around. the only identifyer on the pads is the printing on the back of the pads, which is only printed on.... and can wear off. with nothing printed or legible on the pad, determining the make, let alone the model & spec would seem impossible. Crash test investigation would confirm they were "working" and had sufficient pad material.
you can hypothosise as much as you like as to "what if", and would'nt likely ever leave the house as a consequence.
Reality is the pads perform superbly, stop far better than OE, which when OE fade in hard use, and DS2500s dont, then the DS2500s would be the safer pads to run.
MOT brake testing takes no account of brake materials fitted to the cars, only that they work sufficiently well, which is the important aspect obviously.