Adapts content the 2004-2012 anime never reached, rather than retelling earlier material.
Requires having finished or nearly finished the original anime run — picks up directly where it left off.
Reflects both animation technology advances and reported increased budget priority for the conclusion.
Yes — it's a direct continuation of the original series' final arc, not a standalone entry point, and assumes you're already familiar with the story up to that point.
The original anime run ended in 2012 without adapting the manga's final arc; Thousand-Year Blood War was produced specifically to complete that long-unaddressed gap.