I think he just means “coherent” as “one which we can actually model based on our observations”, i.e. one in which this whole exercise (rationality) makes any sense.
He expects that the universe be incoherent with probability zero, and doesn’t think there would be any sensible observations if this were the case (or any observation being possible if this were the case).
ETA: Merriam-Webster Definition of COHERENT
1
a : logically or aesthetically ordered or integrated : consistent
b : having clarity or intelligibility : understandable
So, understandable and consistent: a universe which philosophy, mathematics and science can apply to in any meaningful way.
I think he just means “coherent” as “one which we can actually model based on our observations”, i.e. one in which this whole exercise (rationality) makes any sense.
He expects that the universe be incoherent with probability zero, and doesn’t think there would be any sensible observations if this were the case (or any observation being possible if this were the case).
ETA: Merriam-Webster Definition of COHERENT
1 a : logically or aesthetically ordered or integrated : consistent b : having clarity or intelligibility : understandable
So, understandable and consistent: a universe which philosophy, mathematics and science can apply to in any meaningful way.