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I think he's talking about the fact that the frame of the walls is made of steel. Then yes, that is somewhat ironic, depending on the exact alloy.

Because Apple makes software walled-gardens.

Isn't that actually the opposite of "ironic", then?

Isn't THAT ironic!

How apposite!

Maybe they're being doubly, super ironic.

There are multiple kinds of irony; I keep forgetting this isn't something well known.

is "wrong" one of those levels

I think he meant "iconic".