As for the weapons mothergoose pointed out, if you read the Legend of Red Eagle, the entire story takes place in the Reach, the area in western Skyrim directly adjacent to Hammerfell. You might also notice the blades' resemblance to existing Alik'r weaponry. With such close borders to Hammerfell, the blades design may have come from there. The runes add more mystery. You don't have to know everything about the backstory of weapons and artifacts you know; assume its in a language long lost to time, or alternatively an incantation from a hagraven (a likely case actually).
Minor disagreements with the backstory of weapons is no reason to include these insanely detailed weapons that turn upsettingly generic weapons into masterpieces (really, with books about the sword why does it look like something every draugr has?). It screaming "mod!" may have more to do with the former argument or the pictures being artist shots rather than in-game weapons.
tl;dr I really like his stuff and would hate for STEP to not include it. Unique Uniques is unique.