Estimated time TASIL 0220
Not at Mach 0.82
Here is a recap from AFR447 actual or estimated. I have put the distance between them.
FEMUR: ACTUAL 0113 (COM at 01.14.31) DIST to INTOL 154NM: 20 Minutes
INTOL: ACTUAL 0133 ( COM at 01.35.15) Estimating SALPU at 0148 and ORARO at 0200
INTOL-SALPU is 122NM 15 minutes and SALPU-ORARO is 122NM 12 Minutes.
ORARO-TASIL IS 119NM and it should be about 11 minutes flight time, the ETO TASIL would have been at/around 0211 not 0220.
Knowing that the last radio contact with AFR744 was just after the SELCAL check at 01.35.43 and that no ETO TASIL was provided to Atlantico, we have to think that Atlantico has given an estimated time based on its own calculation to Dakar.
Another thing is that AFR447 would not have called over SALPU and ORARO but it is compulsory reporting points. Either contact was kept after INTOL with the AF447 and something is missing in the Radiocommunication transcript published in the Report, or contact was lost just after the SELCAL check and Atlantico would have tried to contact him repeatedly and it would be said in the Report.
If my calculation is correct It would mean that crew would have drastically reduced its speed after INTOL.