Dunmer creole. How droll.
Well it does make sense and tbh creole is really not that droll. I speak Hawaiian Creole fluently and it is VERY interesting seeing several culture's languages mix and combine. But there is no way that the Dunmer are speaking creole. First they would need more than one language(there is only one) to make it develop into a pidgin language which then would evolve further into a more stable creole. They have been exposed to all the various races in Tamriel for far to long and they all speak a similar language for that to happen. The linguistics in TES never make sense. Hell most video games linguistics do not make sense.
I can understand them putting accents on certain areas of the game(like riften's people sounding a certain way as opposed to whiteruns people) but to have all those various accents so widespread is just plain stupid. They would have bastardized all language diversity by doing so given even one or two generations. But you cannot expect people to know everything you do just as they should not expect you to do the same.
It would have sounded much better if they kept the dialects less extreme, like that Northern accent that the man who is in banded iron armor in Whiterun's main inn has, who says the guards are idiots. That accent is just out of place in most places. There should have been differences in tone and enunciation sure but anything that drastic just does not make sense without an area of origin. Which it does not have.
I really do miss that raspy voice the Dunmer used to have though. It sounded so good and matched them so perfectly!