It's absolutely true that some autistic/neurodivergent people can struggle with boundaries and may be overly familiar, such as hugging when it's inappropriate. Jokes that are ill-conceived or don't land well can be another problem.
However, Gregg clearly has capacity and is well aware of social norms, on the whole. For example, he knows that it's not OK to answer the door wearing just a towel, and then to drop the aforementioned towel while alone with his female ghost writer...
He may well be autistic, especially as his child is. But there's nothing about his behaviours that suggest a naivete or lack of social awareness. In fact, it's quite the reverse; he seems to be manipulative and somewhat predatory, sexually intimidating women. None of that has anything to do with neurodivergence. He's just your common garden lecherous creep.
I also hate that he's given the whole "autism is a crock of shit" crowd yet more ammunition to fling at us. There's plenty of shitty comments on this thread, and MN allow a thread series which is purely to discuss what shitty people autistic folk are. This claim from Gregg will just back up all of that nonsense.
Gregg's shitty behaviour and lack of ownership is just going to mean more accusations and disbelief flung in our direction. Cheers Gregg. Slow clap. We all think you're an utter fucking bellend who can't keep his sleazy hands to himself.