I've just watched back the recording of the show, and without looking at it in detail it sounds like the audio frames are playing back with very short gaps between them.
The big question here is if they show recording was played as live to playout, or if they had the recordings delivered to them.
If it was delivered to playout, the issue must have been with the recorded file. Playout operate with full redundancy, in other words they would have at least 2 video servers playing the show in sync. I've no doubt playout's first resort when the issues arised would have been to flip between the two, which means both of them must have had the same audio issue, and therefore the recording was the issue.
Is the whole thing perhaps a bit of a paradox? No-one watches anymore, so whoever wins has no real chance of becoming a music 'star' or anything like that, which then reflects badly on the show compared to the heyday in the late 00s? The whole pretence of the show no longer works because it doesn't have the power to discover the 'next big thing' like it once did, no matter how good the calibre of contestants may be. And whilst viewing figures are low, the show will continue in its inability to produce a winning act of note.
I don't entirely agree with this. I agree that The X Factor is becoming increasingly tired and is losing viewers year on year, I myself stopped watching it years ago, but the show has produced popular acts in recent years. Notably Rak-Su won the show last year, and their debut single went to number 2. Their latest track hasn't performed well on the charts, but it is receiving significant radio airplay which has to count for something.