The A350 will only take over once the flights go to daily. There is a schedule at work for 8 weekly at the moment, so, would be an overall increase.
While I seriously doubt CX would give out any details of future plans on the phone, regarding Hainan, let's cut Sarah some slack.
It wasn't just one guy apparently giving duff info, the vice CEO of Hainan himself, George Osbourne and others all gave out 'duff info', so, hardly Sarah's fault for that.