It wasn't about the labour part and whether that is exportable in the off-shoring sense.

It's about the product being exportable (in the sense of being able to sell it for money outside of your country) vs. just having people within your own economy doing "left pocket <-> right pocket".

And even with that, you can sell a waiter's service to other countries. You just have to first make them come - it's called tourism and comes with a whole lot of other jobs / supply chain(s) as well. Some of which can themselves be off-shored!