Considering everything Soldat's done, they tend not to worry too much about other people's dirty little secrets unless they affect how they treat others, in the present. And clearly these two didn't get along.

"In the memory," Soldat says after a moment, "he thought you were the hero. Blessed by the gods. Or something like that. The only one who could cure the Scourge?" Which would be why the situation had seemed impossible, and not one Soldat ever wants to be in. If only one person could make the cure, how could you stay in front of a disease that took millions?