GTD asks you to figure out now the action for each thing, think about how long that will take, figure out if it will take more than 2 (or N) minutes, and if ≤ that, do it now. The "do it now"s can add up to a lot of time and distraction. DBTC is the sorting step but without the "figure out the action" step or (most critically) the "do it now" step. And there's no reflection step, either.
So it's not "literally reinvented", not even "almost".
GTD asks you to figure out now the action for each thing, think about how long that will take, figure out if it will take more than 2 (or N) minutes, and if ≤ that, do it now. The "do it now"s can add up to a lot of time and distraction. DBTC is the sorting step but without the "figure out the action" step or (most critically) the "do it now" step. And there's no reflection step, either.
So it's not "literally reinvented", not even "almost".