From the very correct Judge: the tower dumps requested in this case could reveal the details of thousands of users' devices and would "present the exact sort of 'general, exploratory rummaging' that the Fourth Amendment was designed to prevent."

The article, however, references the key issue this way.

    the data returned from these requests would also include that of various individuals who are not of interest to the FBI's investigation.

This is the language to use when the two groups (suspects and non) aren't overly different in size. That's false here and always will be false when bulk surveillance is on the table.