t’s difficult to call that innovation when we already have foldable phones,

It’s not the idea that’s innovation, it’s developing the technology that folds both ways seamlessly and is durable.
Just because an idea is easy to get, doesn’t mean it’s easy to make. Ideas are easy, it’s making them work that is hard.
And I’m not aware of a phone that existed previously that could do this and fold out to a single 10 inch screen.
Even if it already existed, this is apparently the first good one.