I would say definitely, No. I applied for quite a few over the last year and never got a reply from some of them. I'ts annoying I know, but you have no entitlement to an interview imho.
I think you are definitely entitled to an interview. Whether this happens or not is another thing. Sometimes a person is already earmarked for the position so it's pointless advertising the job. This just wastes everyone's time and is annoying.
In my experience, FAS have little say in who gets on the CES. The sponsor calls the shots and, yes, they have earmarked people for it. Like any other 'job' vacancy, they are not obliged to interview everyone nwho applies.