'What else then a reaction to the stall warning should have motivated the crew to apply TOGA thrust?'
'If they were unaware of Stall, they would select TOGA exactly, why?'
I am not convinced they knew/thought/suspected they were continuously stalled. Perhaps belief in the reliability of the messages and warnings left them and in a fog of doubt they tried to 'climb out'. Nose up and lots of thrust. What was in their minds ...structural anomaly, inexpliable control faults, heavy icing...we don't know, but.......
Edit: 'We have no valid indications...' was it ? Not we are still stalled or try this, that or the other. Yes I know the CVR was heavily parsed but without use of the word 'stall' I think the first question is did they know, and perhaps the second may be, knowing that why did they...........