I agree, because Gen IV time frame is over that for the tipping point of tundra methane positive feedback loop completion.
Less population will only happen with catastrophe, at least enough to affect emissions in time.
Solar is faster, but still limited to manufacturing and installation abilities. Hydro, and wind take a little longer with more expense. Geothermal is even more expensive in a rapidly poorer world.
This catastrophic lessening of population, enough in time to prevent thermageddon, can only be done with something initiating the crash before it happens from lack of food.
This could be from due geologic events or economic failure, or one then the other. If that does not happen in time, then artificial means could do it. A nuclear war could do it and also poison the biosphere to death, unless limited too much, then it will fail with not enough population decline.
Another way is artificially causing a super volcanic eruption by the pressure wave of a geometric pattern underground multi-device explosion.
That has the advantage of lowering population enough AND a long enough cooling period to account for momentum.
In that case, maybe by next interglacial people will have learned to live sustainably, and most of the pollution will be absorbed. Somewhere around 70% of species will still be extant instead of a Permian style or worse extinction.