I stand corrected. Jouty did not say any such thing. The media made that from what he said.
He actually said he did not want to be drawn into whether decompression was a major factor.
The CNN transcript (translation, thank you DCP123)
CNN.com - Transcripts actually states:
JOUTY: At the moment, no. Beginning of an idea. And without going into details, I can't elaborate intellectually and I wouldn't want to do it so as not to go along a path which might be wrong. A depressurization scenario, which might stand in depressurization scenario. I can't elaborate and I refuse to try. A standard depressurization scenario which might tie in with these elements.
It s a poor translation but the gist is clear: Jouty did not wish to confirm or deny decompression was a factor.