I feel like there is a degree of assumption of good faith given to antis here that is not deserved.
The general assumption I am seeing be made is that antis start at a definition of pedophilia and go forward from that - that they check against one or more predefined definitions of pedophilia and if one or more of the definitions fits then that is where they have a problem.
I think in many, many cases it is the opposite. An individual experiences a reaction of disgust, assumes their reaction of disgust is an objective assessment of a problem, and then put into words the reason for their disgust. Having put the offensive into words they assign that “pedophilia” to create a moral justification for their disgust. These ‘accepted’ definitions of pedophilia then get picked up by people to explain why their disgust is objective truth, conflicting ideas pile on top of each other and are cherry picked to suit their purposes in any given situation.
I feel like this more accurately describes anti behavior. A given ship or behavior is disliked, and so one of the definitions of pedophilia is forcibly applied or a new definition invented if one does not exist.
Basically, the core belief is not in any of these definitions of pedophilia. The core belief is that their gut reactions are reflective of objective truth. This is why the behavior patterns of antis are virtually identical to Conservative American Christianity and sexual purity cults while their justifications are built around progressive language. Judging righteousness by gut reaction is a core Conservative American Christianity teaching. The idea is pervasive through our Christianity dominated culture (both secular and religious). You tell what is right not by well reasoned ethical and moral principles but by gut reactions (aka the spirit of god, a conscience, etc.)
What is more, all of this constitutes well understood behavior patterns followed by many groups under many circumstances. Racists being disgusted by the intermingling of races, homophobes being disgusted by gay people, terfs being disgusted with trans people. The pattern of behavior and underlying motivation is always the same, and various justifications are given after the fact by every group. And it is particularly telling that in virtually every case concerns about pedophilia are cited.
Antis, their behavior patterns, and their obsession with using an ever widening definition of pedophilia as a justification for their behavior is pretty much standard for any moral panic. Their justifications are slightly modified in self serving ways, as is the case for all moral panic driven groups.