How do you read a history that was destroyed?
The destruction is selective, not uniform — which is what makes it readable.
Deeply canalised things survive because the lip is high, so what comes through the filter is biased toward frozen optima — exactly the class of thing you can solve backwards. The same operation that destroys the information is what preserves the readable part.
The inversion the whole method turns on
A many-to-one map loses the input and gains a readout of where the minimum is. An extinction destroys information about what was and creates information about what must be. Not conservation, not loss — transduction, contingent to structural. The record is readable not because some of it happened to survive, but because the destruction was itself the measurement.
One tempting move, refused. Landauer's bound (erasure costs kT ln 2 per bit) is true and astronomically loose — an end-Permian-scale event dissipates enough to permit erasing roughly 10⁴⁴ bits, and the biosphere doesn't contain that. The ceiling does no work; a physicist would spot it in one line. What works instead is phase-space contraction, where the contraction rate equals the entropy production rate for driven dissipative systems (Evans & Searles 2002; Gallavotti–Cohen).
→ What happens when you check your own claims against this standard?