The retail version that was updated on May 2nd is being listing for TBC is some of the addon managers, such as ajour.

That's either a problem with the managers or with whatever data-source they're using. The release is clearly marked as being for WoW 90200.

I'd guess it's because Curseforge shut down their old API finally, and whatever fallback these managers are using doesn't actually have the information they're looking for.