CONF iture:
A pitch up/down moment in response to power changes is always to be expected in a conventional aircraft. However, the A330 is a 'fly by wire' aircraft and as I understand it, pitch changes with power are 'ironed out' by the fly by wire system. For example, on the B777, also fly by wire, the a/c has to be positively rotated into a climb attitude on a go-round, as the natural pitch up is removed by the PFCs. If AF447 was in a degraded flight control mode, the crew may have encountered an entirely unexpected pitch change, with power change, if they inadvertently entered a CB.
It is encouraging that the FDR module, although missing the CSMU, is not buried in silt to any extent. I do not see any footprints or scrape marks around the the FDR housing, so not much for any conspiracy theorists to go on.