He's referring to this technique's effect of obscuring interpretibility. Making it much more difficult to verify chains of thought and alignment.

It's not like llms can't hide reasoning in the upper layers of any given token as it is...

	▲	fluidcruft 33 minutes ago \| parent [-]
		I believe the theory is that if selection pressure is not applied at that level, then developing deception in that level becomes an inefficiency (=less adaptive and unlikely to be conserved).