As far as I am able to gather from the single book on the topic they are nothing.
The book Is written in Daedric and is a quote from N'gasta Kvata Kvakis.
NKK is just some Esperanto from the Stolkholm Esperanto society website but it is written in the language of the Sload from TES.
So it's stuff from a constructed language, converted into another conlang, and finally made into yet another conlang.
Languageception, there may eventually be a lore purpose to it but I think it's just a gag by the developers.
If you want to read "The bible of the deep ones" it is here.
If you want to read NKK it is here.