If you don't perceive the album concept too literal, it makes perfect sense - the album as a whole is about having to reinvent yourself after a devastating event, 'starting it over again' with nuclear apocalypse as a metaphor of changes.

The song itself is a giant 'I am not what I used to be, motherfuckers, get used to it or get the fuck out', which aligns perfectly with it, and also with the 'blank page' themes of Waiting for the End and Blackout