... technology itself has changed.
That assertion with itself is contextual. It alludes to an earlier statement in the conversation where the discussion was about change occasioned by technology (or something along those lines) and states that technology has not only caused change but has itself changed. It brought change and it too has changed. Itself is a way to focus attention on the preceding noun in isolation, as its own context.
We were talking about how work in an office had changed as a result of technology, but then we got to talking about how the technology itself had changed—typewriters, telegraph, telephones, carbon paper, photocopiers, desk calculators, computers, fax, email, and so on.