Why pick the S model as base instead of the original? If you pick the original as the reference point, you cover all Xbox owners, with S owners knowing their experience will be at least the same. Same workload for DF; broader, more applicable results for readers.There's other places that give OG Xbox framerate/times e.g. VG Tech.
Considering the amount of work that goes into DF and what they cover, I think it's more than fair for them to leave the OG up to others to do, and if your interested in that metric then you can hunt them out.
90% of the time the differences between OG and S are negligible at best.
That's one of the many reasons it's good to have multiple places doing it in the first place, including checks and balances.