It has been possible to detect operations before they occur through clever analysis of open source data. The US military became aware of this many years ago and has spent a lot of time studying this type of exploitation.
The US pays people to search for and red-team their real non-public operations using OSINT. It helps the US understand how exposed they are, how to effectively hide in the OSINT environment, and how to manipulate OSINT to misdirect adversaries sifting through the same data.