The FR24 flight path then suggests the aircraft levelled off c 3000 feet above the local terrain and then a minute later .... when the 350 knot aircraft intersected the rapidly rising terrain.
No, that additional minute is almost certainly an extrapolation artifact to hide temporary loss of realtime data and provide smooth animation of the little airplanes symbols on the FR24 website. If you download the raw data, it ends in a descent and there is no levelling off.