CONF iture,
Re the "prends ça" exclamations: Otelli attributes the ones at 2:11:55 and 2:11:57 to the captain, whereas the BEA attributes them to the PNF. I would think the BEA version is correct.
Otelli writes that, from 2:11:57 on, the instrument readings alternated between valid and invalid (intermittent "Non Computed Data" condition) "when the AOA increased or decreased below 41 degrees....depending on whether the copilot pulled back or relaxed his grip on the joystick".
When, at 2:12:04.3, Bonin thought they were doing a "crazy speed" and started to deploy the speed brakes, they were actually doing 90 knots. Robert, who was PF, disabused him of this idea in short order. At that moment, according to Otelli, they were just below FL300 and descending at 15300 ft/min.
At 2:12:17 and FL250, Bonin took over the controls. From 2:12:27.4 to 2:12:32.4 there was a period of confusion as to whether they were climbing or descending.
Judging by Otelli's account, the pilots seemed to be aware of their altitude at least most of the time (and certainly below FL100), although at 2:12:45 Bonin asks what the altitude is. Robert responds, "What do you mean?". No reply from Bonin. They were at or just below FL200.
Lastly, I don't know of any link to the AF447 CVR part of Otelli's book. The chapter on AF447 occupies about 1/3 of the book. The rest of the book deals with Air India Express 212 and 812, Spanair JKK 5022, Vladivostok Avia 352 (Tu-154), and Korean 804.