The aircraft was doing, say, 150kts, i.e., 250ft/sec, and was at something like 1000ft
There have been a number of reports that the a/c was flying at about 1000ft. I don't know whether these have all come from one source or from various.
What seems odd to me is that the last clearance they received was
direct LANET, cleared LANET ILS 33, descend 4000 feet (source: this thread).
Looking at the approach plate for the LANET ILS 33, they were on or near the 11DME arc. The plate shows establishing on the ILS at or above 2000ft.
Based on those two pieces of information, they should have been nowhere near 1000ft. Were they below the flightpath or did someone just imagine that they saw the a/c at 1000ft?