they say all pressure data (pressure altitude, TAS, vertical speed) are unreliable right after the "event"
If the origin of the data considered is "pressure" wouldn't that mean it's derived from the static system? The static ports could have been sensing wildly varying airflow if an "event" caused departure from controlled flight?
I'm not knowledgeable on FR24, so cannot comment about the value of that data, but in general, perhaps civil data gathering is reaching a point where instantaneous information is available at previously unseen resolution? There's just more to consider?