Hi bearcats667@gmail.com ,
Unfortunately, in the symbology profile it is not possible to access values from another featureclass. You can only access the attributes of the current feature to define the symbology.
In case this a a static condition, you could perhaps create a field and use the field calculation to perform the validation and use that field for symbology. Can you explain a little more about your use case? Why does a value in another featureclass define the visibility of a layer? Is this only in the current view window or does this apply to the entire featureclass?
