I am also still not considering the hub a "land." If it had its own little port of entry and was designated one of the themed destinations, then I could say 'yeah.' Much like how you can consider The Lost Continent a land at Islands of Adventure...
...For instance, I also don't consider Main Street USA at MK a main 'land.' Even though it technically has some attractions, shows, and entertainment. Same goes for The Oasis at Animal Kingdom.
That is an odd semantic qualifier.
Why would Main Street or Celestial Gardens not be considered a land when Liberty Square is?
They serve a different purpose in a hub park.
It's a themed environment people experience in the park.
Celestial Gardens is going to have more to do in it than Liberty Square or Main Street USA in terms of attraction operation.
It may not be everyone's type of environment, but it's a land within the park.