That isn't how Tourettes works.
He could know that it's a possibility, sure, just the same way he could walk past someone and called them a paedophile, or a woman and call her a bitch.
You don't know what words will come out until they come out. Or if they will come out at all.
The more you try and hold it in, the more it wants to come out like a dry, tickly coughing fit that makes your eyes water when you're in a public place.
He could have shouted any profanity, or none at all, because that's just how Tourettes is.
And then you say something once, and you feel guilt and shame and it's like that niggly tickly cough, the more you think about holding it in, the more it comes out.
You do not have the processing time to remove yourself before expleting any profanities.
He removed himself as soon as he realised his presence was causing distress. That is all he could do, and he did it. But it isn't enough for some posters.
The only way in the world he could not offend anybody is if he just didn't ever encounter anyone or kept his circle very small, and that is the precise thing he has campaigned all his life against. To be hidden is to be unseen and to be unseen is to never be understood, or accepted. To have no representation. For others with Tourettes to feel they have to hide and feel ashamed or lock themselves away for risk of being harmed by people who willfully misunderstand them, or worse, fully understand them but willfully take offense anyway.
The BBC have done a terrible job at protecting this man and his legacy and also safeguarding it's participants.
The N word is a horrible word. There is absolutely no denying that. However to say it is offensive from someone with no control over the language that leaves their mouth when they've taken every possible precaution bar barricading themselves inside and going against everything they have ever stood for shows a double standard that I had hoped we'd left behind decades ago.