Of course it is, unless you don't think IT outsourcing is "a thing"? It is literally no different to the factory or shipyard or steel mill closing in country X and reopening in country Y.
We are talking about the US election voting splits, so the British definition is interesting, but not relevant. In the US, blue collar usually means some sort of physical labor. If you are sitting at a desk, it is white collar, no matter how menial the task.
