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Neither this article nor the previous one (https://www.cnn.com/2020/04/24/tech/nintendo-accounts-hacked...) mention how this breach took place, but I'm guessing it's reasonable to assume that this was related to credential stuffing.

This hit me, and my Nintendo account was using a unique keepass generated password.

Did you have a Nintendo Network ID linked to your Nintendo account though? Was that NNID password secure?

That is quite possible, I do remember some linking at some point, will have to check.