I agree. It's kind of ironic you mention "denial". It turns out this is one of the favorite attacks by "SBS proponents" against those who challenge the scientific reliability of the diagnosis. We are called "denialists" and we're accused of "denying the existence of child abuse" (?). Parents in my organization (Adikia) who face false allegations of abuse are said to be in "denial" of their own abusive behavior. This story line appears to be quite credible and powerful within the medical and judicial communities.
Here's one among thousands of examples, from a really terrible paper by one such powerful SBS proponent here in France [1] (another of his papers was actually retracted this year [2]).
"Fake news 11: the caretakers’ denial is sincere
Clinicians and defenders can become intoxicated by the denials of parents suffering the agony of having their child in dire condition, and at the same time being grilled for their possible responsibility. The mental mechanisms of self-denial are well-known to psychiatrists. A perpetrator, after a violent burst, and faced with its terrible consequences, can experience a dissociation mechanism similar to witnesses of catastrophes, dissociation being understood as “a break between the memory, the perception, the consciousness and the identity…when faced with unbearable feelings”. Sincere denial easily elicits compassion from the medical staff as well as defenders, a natural response which is enhanced by professional training. Some authors have documented with functional imaging the sincerity of denial in a case of convicted child abuse and concluded that the sincerity of denial is not a criterion for innocence."
[1] https://link.springer.com/article/10.1007/s00381-021-05357-8
[2] https://link.springer.com/article/10.1007/s00381-023-05889-1