Alzrius
The EN World kitten
I'm guessing the wiki just hasn't been updated recently, as the two Waterdeep adventures were published in 2018 and Baldur's Gate: Decent to Avernus was published last year.
I only have Dungeon of the Mad Mage, but a quick glance at its credits doesn't show Ed Greenwood's name as being among them (save for being one of the authors of a different book that was referenced for that one). Presuming that's the same for the other two, that would be why the wikis don't list them, since they're his bibliographies.
Now, that's presuming that the supposed contract is based around his having Realms material published in a given year, rather than any Realms material published; that latter interpretation is one I hadn't heard before, and honestly sounds even more suspect to me.