By that number you mean that 2 in 10000 buildings fail at some point due to some design issue? Because building reliability is a very hard concept to define, even more in the context of machine reliability (we are discussing robots here).
Anyway, machine reliability is calculated over usage, not lifetime. It gets much larger numbers.
You are off by a few nines.
Transportation machines are expected to have 5 or 6 of them. And those are the most dangerous kind we keep around. Everything else is more reliable.