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Saturn V, #1868,
you are correct in your statement that the French words
"Ces conditions sont particulièrement fortes"
can be translated into the English words
"These conditions were particularly severe".
But where in this little piece of text do you see the word "turbulence"?
The typical ITCZ conditions that were particularly severe may mean that there were more CB's than usual, so a little more deviating action than usual could be necessary.
Once again, as BOAC has stated many times now, it is not at all necessary to fly through the middle of a CB, in order to get the pitot icing problem. I have seen the TAT anomaly (TAT probe icing due to high ice crystal content) when flying through "light green" radar returns in the neighbourhood of CB's, in other words, while avoiding CB's. Turbulence then was only light, occasionally moderate, nothing out of the ordinary. Saint Elmo's and a sound like rain on the windscreen were also present.
Certainly it is problematic that on certain Airbus types the pitot heating can be overwhelmed by ice crystal icing, that's why a recommendation has been made to change the type of pitots, even before AF447 happened, but the outcome of the accident has much to do with basic pitch and power flying. Remember, four perfect attitude sources where always available, showing a very unusual 15 degrees nose up attitude at high altitude.