Seemingly so - the aviary at the left of this photo is just in a conventional row of small aviaries and the one at the right is a standalone one - the bird had free access when we were there.
all kea love shoes! In walk-through kea aviaries (should you ever happen to be in one) a kea would be happy to sit there all day dismantling your shoes while you are wearing them.
I imagine the tunnel would be awesome for them too. They love exploring and getting into awkward places. The more variety in their cages the better.