As per this announcement:
https://www.elderscrollsonline.com/en-us/news/post/26355
You might have already noticed, but we've changed which versions of The Elder Scrolls Online are available for purchase in stores. The product known as The Elder Scrolls Online: Tamriel Unlimited is no longer available via digital retailers (ESO Store, Steam, PSN, Xbox Store, etc) and is no longer being produced for physical retailers. In its stead, we are renaming the product currently known as The Elder Scrolls Online: Morrowind to simply The Elder Scrolls Online, and it is becoming the base game version of ESO. This means that moving forward, if you purchase this new base game—The Elder Scrolls Online, not The Elder Scrolls Online: Tamriel Unlimited—it will include the Morrowind Chapter.
With this in mind, in order to provide more options for The Elder Scrolls Online's community, we're opening PvP Battlegrounds access to all ESO players and updating how you can acquire Morrowind content and its different features. Soon, the Morrowind zone and story content will be available for purchase in the Crown Store and be accessible to all ESO Plus members. In addition to this, the Warden Class will be available separately in the Crown Store as an Upgrade. All these changes will occur when ESO: Summerset and Update 18 comes to all platforms on June 5.

Ok but it says Tamriel unlimited though?