I am not sure how our empirical scientists or even our theorists can be so sure that solar fluctuations are not part of our historical climate artifact picture. The ability to measure solar output in absolute terms has only become possible in modern terms. Complex probes to other planets might eventually be able to discover dateable artifacts that would either reinforce or contradict the thesis of solar fluctuations.
I am not sure how our empirical scientists or even our theorists can be so sure that solar fluctuations are not part of our historical climate artifact picture.
Because we cannot control or limit the SUN, but we can limit and control what the peasant serfs do.