johnamos:
In is not correct to say that Tyre was not subject to Babylon a full 70 years and different nations came under that domination at different times.
It is correct in the sense that the JW source that I quoted conflates ‘subjection’ with ‘exile’ and that Tyre was not exiled for the 70 years during which Babylon was ‘world power’, which in context really meant ‘had control of territories that were previously controlled by Egypt’.
Compare the concept of nations ‘serving Babylon’ for 70 years with the ‘calamity’ (Jeremiah chapter 25) that ‘went from nation to nation’. The ‘calamity’ referred to attacks on individual nations which happened to different nations at different times, whereas they are all considered to ‘serve’ Babylon for the full 70 years.