I mostly agree with your comment. The problem arises when DLC produced by freelancers (freelancers is the best case scenario - the other being a free-for-all Greenlight with minimum input from Bethesda) becomes the norm. Don't even think that small DLC (textures, armour sets, etc) will be hand-picked, or that the "Curator" will be burdened with extra costs to differentiate them from a mod. I am sure some chaps would even pay a small amount to have their work feature Bethesda's seal of approval.
Should a professional game dev be treated as a talented "Creator"? The Creation Club announcement could target both industry pros and amateur modders. This is a set up for major complications, especially when it is part of a promotional campaign taking place at E3. They didn't update Zenimax's corporate site with job openings (iirc, Hearthfire DLC was made by hiring modders). This is not an internal memo but a marketing campaign, a telling sign that Zenimax intends to override a community network (aka the modding scene), not push the industry's creative boundaries.
A mod like Frostfall is fully worth an asking price. Even a texture pack deserves to be paid if the creator wishes so. That does not equal trapping content creators inside a closed system while devaluing their, as well as the industry professionals', work. I am certain that Bethesda's DLC platform will be expansionary in the long run. The statements they issued employ tactful language. They won't release mods per se, but there is enough ambiguity to associate curated DLC with mods in the future. As is the norm in such cases, the only enabling factor is the IP. The work (even the promotion) is done by others but the gains belong to the IP holder.