According to both Beth and Obsidian, cut content is not canon, or even semi-canon. So the idea that the ingame stats reflect canon is dubious at best. Some things to consider:
1)According to official canon(not reflected in FNV!) the T-51b is the best power armor before hellfire. This mean that, technically, remnants armor is lore-breaking :/
2)In Fo3 the T-51b had the same DR as Hellfire, in TTW, it is weaker than Remnants. This is obviously an issue for those who want to keep both games balanced.
3)The Hardened Armor would be unique, so there is no reason it cannot surpass the Eastern Enclave armor.