Footways in subway stations should be tagged with `key:tunnel`?

In general subway stations should be considered buildings, tunnels or both?

I don’t mean the volume around rails where the trains move.
I mean the set spaces, on different levels, where normal citizen are allowed to walk,
the facilities like amenities and shops accessible inside, the stairs and elevator connecting them.
I checked very few samples and many seems to be tagged as tunnels.

The question come from this MapRoulette challenge: (about this way: osm, indoorequal)

I should remove the tunnel=yes tag or add something like layer=-2;-1 on top of level=-2;-1?

For reference:

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