bigger question is is this the original owner? and was the tranny ever serviced before. owner seems to be claiming he keeps up on the maint, so maybe hes a good owner and had it done 50,000 miles ago, if so thats ok that he flushed it.
its when its never had a service in its life and its over 100,000 miles your asking for trouble. but then some times if it wasn't beat on, aka adult owned, the fluid may have been in good shape when he had it flushed.