Ok so I just watched the video. There is no chance he’d get charged for racial incitement on that, because he’s not. He’s used a racist insult but that’s it. You could at a stretch argue it’s inciting hatred towards Reform party candidates as that is who he is referring to, calling them white devils, but then he doesn’t say he’s going to do anything to them as a collective.
That will also be why he wasn’t arrested for inciting racial hatred, he was arrested for the death threat directly in the second video. Sentencing guidelines for that are here -
Threats to kill – Sentencing
www.sentencingcouncil.org.uk
In terms of the delay, Danczuk says he hasn’t been prosecuted yet so I’m assuming he’s been charged but is one of the tens of thousands in the courts backlogs.
I would argue he is intending to incite racial hatred by using racially hateful language, and it doesn't matter if it's Reform candidates, if you use a racial slur to describe a group of black accountants and threaten one of them with murder for example, you can't hide behind the defence of 'it was aimed at accountants'. He distributed the material online so he quite clearly meets the requirements for the offence. Especially when you take account of how flexible the courts have been in interpreting the offence previously e.g. Sam Melia, undoubtedly a Nazi sympathiser and white nationalist, but whose crime was posting stickers that read 'white lives matter' and 'reject white guilt'.
I very much doubt the Danczuk case is in the backlog. People use charged and prosecuted interchangeably and I very much expect that the accused hasn't been charged with any offence given the last we heard was that he'd been released without charge.