"My point is that autism in itself isn't the cause of any cb, there's always something impacting that needs resolving."
DSM 5 has, as part of the diagnostic criteria, a non-exhaustive list of examples:
"Deficits in nonverbal communicative behaviors used for social interaction"
"Hyper- or hyporeactivity to sensory input or unusual interests in sensory aspects of the environment"
"Deficits in developing, maintaining, and understanding relationships, ranging, for example, from difficulties adjusting behavior to suit various social contexts"
All of those things, which are directly part of the autism, cause the behaviour which manifests. Nobody is suggesting that the trigger for the behaviour shouldn't be investigated and treated (we have ABC charts, for example), but the trigger doesn't cause the behaviour.
The trigger is the thing that initiates a response, the autism is the thing that shapes the response.
In the same way, a person with an eating disorder can be very violent when they are confronted with fear foods, or are asked to eat quantities that are higher than their brain says is ok. Food is the trigger, but the eating disorder is the cause of the reaction.