I think it's the other way around; Really Simple Syndication is a backronym - for every other historical explanation, I can't see an acronym like being created

I think it's the other way around; Really Simple Syndication is a backronym - for every other historical explanation, I can't see an acronym like being created in the early days of the internet. Once it took hold/potential realised, it needed to be translated to less technical folks.