A learned sounding commenter said...
The level of the RULC index has no meaning. The RULC index is only used to show the rate (and direction) of change in labour costs.
Stable RULCs imply that the wages share of national income is stable, whereas falling RULCs imply a falling wages share*. If the real compensation of labour grows at the same pace as labour productivity, then both the wages share and RULCs will remain constant. The falling RULCs (and falling wages share) in the 2000s imply that the growth in the real compensation of labour has lagged behind productivity growth.

- yawn.
I think most of the noise at present is that the cost of doing business is comparatively expensive when compared to, say, India, China or pretty much any of our neighbours. This is true because we have a system that protects the workers through a minimum wage, as just one example.
...in short there are calls to import cheap(er) labour from overseas for project such as building infrastructure. 'Tis where the noise is coming from.
As an aside I am noticing more and more offshoring of work, and it has moved to white collar jobs.