What does this equation mean?

What changes, if this framing is taken seriously, is narrower than a resolution of the black hole information puzzle and more useful than a slogan about horizons keeping secrets. The Page curve already settles, at the level of von Neumann entropy, that unitary evaporation must eventually return everything [ 4 , 5 ] . What it does not settle, and what $t_L$ and $t_G$ are built to make precise, is that “everything” is not a single undifferentiated payload arriving on one schedule. A future account of black hole evaporation that reports only a single recovery time for all thrown-in information is quietly averaging over exactly the distinction this article insists on keeping separate — and any such account should be asked, in the same operational terms used here, which kind of information its single number is actually a promise about.