Who would think any pilots could find a way to put an Airbus below 60 knots airborn?
The aircraft (Airbus 330) itself dynamically never got 'below 60 knots', only the sensors associated with the air data system.
With minimal 'handling' demarcation between stalled & un-stalled other than the turbulence masked buffet, the speed at which it 'gently' mushed into the stalled condition was somewhere around 185KIAS, at a point in time where the KIAS on one or more displays may very well have been temporarily available to them, as valid air data was intermittently recovered at numerous points.
Without re-reading Interim #3, I believe it settled in somewhere around what would have been equivalent to 150KIAS on the displays had the air data sensors not been corrupted essentially by actual flight path versus body angle.
This is the reason for pages & pages of discussion about full time stand alone AOA availability, not connected to the ADR's and their 60 knot threshold for validity.
(Correct me if I've stated something in error here.)