Thank you for that article Gilles, , shed some different light :
the aircraft captain was kept separate, because the victim had accused him of having coerced her (according to her complaint, he would have told her that if she did not sit in her seat again, next to the passenger who had been masturbating, he would have her put in jail once they landed).
That brings the Flight deck crew in this saga. The original article (in French) was based on a letter from a cabin crew union and makes no mention of the Captain being directly involved. And there is no mention of the incident (yet at least( in the SNPL web site , generally very quick to defend pilots...