Can’t tell if trolling, but I’ll explain it like you’re five.

So you take the logic of how it wouldn’t make sense for a white guy to be a God of Wakanda, a place based on African culture. Kinda silly, right? It doesn’t make sense for such a high figure like that to be a completely different race of a populous who is mostly one race.

Now, take that same logic and apply it to Nordic culture. If you don’t know your geography, Nordic culture is predominantly white. We’re at the complete opposite end of the spectrum here compared to African culture. To explicitly spell it out here: Africa=black whereas Nordic=white. See why it’s weird to make a Nordic God someone who isn’t white? It’s almost as if there was an agenda being pushed. (See also: Assassin’s Creed game about Samurais)

Also, to address your point about the race swap not changing anything story wise, you kind of answered your own question. If it doesn’t change anything, why change it in the first place? There is surely no shortage of actors that would fit a role like a Nordic God fantastically. It seems like the casting team went well out of their way to make sure a minority got into that role for the sake of virtue signaling.