I believe
Brian Abraham posted something on this on the AF447 Thread No. 11, just started.
Re, "If that is true, meaning fidelity is not assured, then why is high and low altitude stall recovery still a required sequence in the type rating syllabus for various jet transports. "
The actual stall is not a required sequence for training and checking in any syllabus. Normally where required, (and it is not universally required by all regulators), it is the approach to the stall, where buffet begins and the aircraft's stall warning / stick shaker / stick pusher etc activates. Recovery is expected to begin at that point and Level D simulators up to that point have, I believe, been validated. It is aircraft behaviour in a full stall that does not have data from actual flight testing.