Yeah, except those set pronounciations scholars, institutions and dictionaries propose basically work for those who are not native speakers.
Portuguese is pronounced differently in Portugal, in São Paulo (southeast of Brazil), in Bahia (northeast), in Angola, etc.
English in pronounced differently in New York, in Sydney, in London, in Liverpool, in Ireland, etc.
Hell, English is even written differently for some words when we compare the American and British.
All of those are nothing but cultural differences, dialects. A language is not ecstatic. It evolves along with its people and no dialect is more right or wrong than the other.
Also, names like LeBlanc which are obviously derived from French should be pronounced like French, if we wanna be picky. Same for Sejuani, which on top of it all is inconsistent with the pronounciation for Freljord.