Because language is defined by usage, if there was a body of water that is freshwater but widely agreed to be a sea then the parent commenter is agreeing to revise their definition to match.
I thought I'd go with the same method as the article, using examples. I dismissed all the examples the article has given, and asked for better examples where we call a fresh water body a sea. I think we haven't and shouldn't. It's already confusing enough.
Call all salty water bodies seas would be fine with me. But including non salty waters will only add to the confusion.
