Telescopes are great but aren't going to tell you much about the exact radar capabilities of a nuclear aircraft carrier, nor what tactics it would use if it did

Telescopes are great but aren't going to tell you much about the exact radar capabilities of a nuclear aircraft carrier, nor what tactics it would use if it did see a craft, nor submarines (one of the incident reports claimed the tictac went underwater). And monitoring Earth is a very general thing, it can even include getting up close with the native wildlife, it isn't restricted as a concept to viewing from a great distance.