I have seen posters on here insist that a child with SEN cannot be disciplined for disruption, “because it is a direct result of their disability,” for example.
I don't think so. The issues around discipline aren't solely in relation to disruption; they are around punishments for not having the right uniform or the right equipment or failing to complete homework, which instantly disadvantages children with executive functioning problems, developmental co-ordination disorders, sensory problems and the like.
So far as disabilities that may give rise to disruption are concerned, the point is that the first port of call should always be giving the right support. For a child with attention difficulties, for instance, this could be support in keeping the child on task. For a child with ASD, it could be help with sensory difficulties so that the child doesn't react to distress to excessive sensory input, or help with communication so the child doesn't react to frustration at difficulties in understanding or being understood, or careful preparation for change, or identifying and avoiding triggers. If there is a rigid discipline system in place that assumes that the first port of call is going to be punishment, if anything you exacerbate the child's difficulties.