That's not actually what the story I linked you said at all. It said that getting a conviction in Saudi Arabia was difficult, shaming, and often dangerous for a woman to even report. That's not remotely the same thing as crime being less.
In some cultures, rape is virtually non-existent, and not because death is the punishment.
“In cultures where there is no historical belief in male dominance, or coercion and violence as a demonstration of masculinity, rape is nearly unheard of. In fact, in at least some of these cultures, rape is seen as shamefully unmasculine behavior. The Minangkabau of Indonesia, the world’s largest matrilineal culture, is a place where men move into their wives' homes after marriage. It is also a place where rape is largely unknown, in part because it is considered unmanly.
Violence in Iceland is also extremely low - not just rape but all forms of violence - and not because of the threats of severe punishment either.”
FYI, the Minangkabau are a devoutly Islamic culture.
"The shared identity among Icelanders fosters a strong sense of community and mutual understanding, key elements in maintaining social order and preventing crime. Icelandic society places a high value on trust, cooperation, and respect for the law. These values are reinforced through social interactions, community engagements, and the nation’s education system. This collective mindset, where everyone looks out for each other, plays a significant role in crime prevention.
In essence, the social fabric of Iceland is woven with threads of unity and shared responsibility, creating a society where crime is seen as not just an individual transgression but a breach of the community’s trust."
