Anyone interested in this case would be well advised to read this document (this is not the simulation).
Not a simulation - but guesswork. The whole basis for the Boeing airspeed calculation is based on estimates - they didn't even use a known (factual) starting point for their calculations (it was a r/t position report for goodness sakes - not a radar plot). Please don't rely on it - it's just guesswork, and not very good guesswork at that!!
TAC