Lin Shen genuinely did not recognize Catherine, and even without the mosaic on her, he wouldn't have been able to identify her either.
Previously, he only knew that the Wan Family worked under a highly esteemed woman from the Diman Tribe, to put it another way, the Wan Family were merely the lackeys under Catherine's lackeys, possibly even lower; they didn't even dare to utter Catherine's name.
The little information Lin Shen knew, he had found out later.
The deadly fights between the Wan Family and Lin Family were not actually at Catherine's instigation, but because the Wan Family feared that Wan Nianbei and Lin Miao's affair might affect the relationship between Catherine and the Wan Family, they took matters into their own hands.
Of course, if Catherine had intervened, she might have been more ruthless.
Catherine initially didn't know about Lin Shen either, until Lin Shen later became famous in the cosmos, and only then did she realize there was this grudge between them.