It appears that objects in orbit around Earth can be visualized in any of a number of websites. These sites use actual tracking data in order to depict the current position, velocity vector, and projected path of any given object. However, it seems that this is based on "recent" tracking data, meaning that for objects not imminently de-orbiting, the path projection is valid within some degree of accuracy.
When the Long March core (2021-035B) de-orbited, these tracking sites appeared to be showing "current" data based on orbital elements derived from "recent" observation - the depicted "current" status is itself an extrapolation based on observation made hours if not days ago. Consequently, what appears to be "current" status for a de-orbiting object isn't really, and representing it as "live tracking" is really not so - it is more of an expectation based on certain assumptions rather than up-to-the-minute observation. To some extent, this is the best that can be done because there's likely no practical way to continuously observe every object everywhere in orbital space all the time. In the case of the Long March core, its re-entry was not observed and only estimated to be over the Indian Ocean.
My question is: within practical limits, is there true "live" tracking available/possible, at least for large de-orbiting objects for which path prediction becomes rapidly inaccurate/unreliable, and which could pose a threat in the unlikely event one came down over a populated area? If so, would it be offered as a public feed or would it risk exposing classified information about military/intelligence assets or capabilities?
