Every other faction doesn't use these? Yamatai has its own, and there was at one point a WIP NDC one, though I never finished it and don't use it currently. Further, I don't see anywhere where Nepleslian ships are categorically faster than Yamatai's on that table.
In fact, broadly speaking they're slower in every respect, with a couple of small notes: Nepleslian scouts can match the FTL speeds of Yamatai fast gunships, and their cruisers are going .83 ly/m in Hyperspace. Yamatai's speed table doesn't have a defined cruiser category, and I believe that most of its cruisers are built to the "Standard Warship" speed on their table, so I chalk both of these up to a difference in how ships are classified between nations.
In every other case, as best I can tell, the Nepleslian Speed Standards exist mostly to keep Nepleslian ships a little bit SLOWER than their Yamataian counterparts, and the CDD and Hyperspace Fold speeds in this submission and in the NSS merely match Yamataian counterparts for ships similarly built for mobility. If the 1 ly/m HFD speed and the 2.5 ly/h speeds are rule-breaking, then the Plumeria is in violation as well.