The way I interpreted it, he did separate Skywind and Skyblivion. (8:43 ) I think he was referring to the release date being late 2018-2019 (From Skyblivion discord: We don't have an official release date but an ideal one would be 2018 however the chance of the release in 2018 is slim.)And that was why it is a long way off.
Also in the Skyblivion discord :
Will it be on both Skyrim and Skyrim Special Edition? Yes. We are first going to release Skyblivion for Skyrim and then when SKSE64 is out for the Special Edition we will port it to the newer Skyrim.
They are trying to keep it lore friendly Skyblivion says:
"Will you be able to travel between Skyrim, Cyrodiil and Morrowind? Uncertain at this time. You will be able to somehow travel between skyrim and cyrodiil, but not morrowind."
And Skywind says:
11. Q: Will you be able to travel between Morrowind, Oblivion, and Skyrim?
We have no plans to support this as it doesn't work with the Lore.
Lastly Gopher did post this video