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Can Salesforce Duplicate Management compare across objects?

Is is possible for Salesforce Duplicate Management matching rules to compare across objects?

This article talks about cross-object duplicate rules:


as does this Salesforce help page:


This article shows how to make them:


but it doesn't match what I see in the Salesforce matching rules screens.

When setting up matching rule criteria, there appears to be no way to select anything other than a field from the current object.

Is this a feature that needs to be enabled somehow or that existed and was withdrawn?