Because it had no material impact on him at all, his case is a load of spurious nonsense.
It was never broadcast in the US, his claim that it was a deliberate attempt by the BBC to damage his chances of being elected, is laughably ridiculous.
The edit was clumsy and was clearly an error, but a clear three second break between the two clips and there's no issue at all. It was also completely unnecessary, they could have shown the whole speech, with almost exactly the same outcome.
I suspect it will be thrown out, but if it does make court, it's going to make for great TV.