The character has a photographer and possibly an assistant to help watch over things. Disney is backing their employee who is claiming this happened, so I doubt that it is just her word against his.
Furthermore, every time a character reports this kind of thing, it is noted on Disney's end. If this women was claiming inappropriate touching left and right Disney would know. I assume she isn't because Disney believes her claim, so she must be an upstanding employee and isn't out to blame men falsely.
He has been in trouble TWICE in the same month with inappropriate touching of two different Disney employees.
Furthermore, I could see how someone might accidentally graze a chest area with a hand or something and immediately apologize. I do not see how someone could GROPE a left side of a chest THREE times accidentally. There is a difference between grope and an accidental brush over.
Yeah people should be careful when touching people they don't know. This includes character interactions. I am careful not because I live in fear of being accused of doing something but because it is the right thing to do. I do not know this person who is in this character suit, I would hate for them to feel uncomfortable in my presence.
People who are hired to be characters know what comes with the job. They know it includes thousands of interactions with people they do not know, and this includes being touched by them in non inappropriate ways. Heck, some young kids accidentally touch them inappropriately and do things one wouldn't expect. I am sure Disney hires accordingly and doesn't hire people who will be offended by a meaningless/accidental touch. GROPING on the chest is something that should not be tolerated.
Disney is quite lenient with its guests. I have personally seen characters dealing with delusional guests who want to say or do inappropriate things with the character. In a specific case, the cast members tried to handle it with grace and make sure nothing bad happened to the character. They didn't kick the person out of the park, they just knew who they were and what they were up to and protected the character from him. Granted the person in this story was not mentally all there. But this isn't an uncommon thing for characters to be faced with.