Unfortunately the MapPinPoint does not contain the functionality like you need. I would recommend to use a custom template for your data items. You can add necessary property in your data item class to allow changing a visibility of the text. For more information about Data Binding feature you can take a look at the following documentation topic and online example:
Also the information layer supports using of the item template selector. It contains the AllowDataTemplateForZoomLevel property. When you set it to "true" then it allows using different templates for different zoom levels on the map.
I have attached a sample solution which implements this approach.
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