Ex-muslim claiming that our prophet was being raped in his childhood by one of his cousin...? Is it true..?

Assalamualaikum , my name is Zaid I just saw a video in which an ex muslim was claiming that our prophet was being raped by one of his cousin ?? and because of that our prophet when asked by omme salmah were refused to enter into makkah/madina..?? The reference of the hadith which he showed is in Al Sirah Al nabawiya sirah Ibn hisham.. The hadith is about abu sufian ibn harith and abdullah bin obay omiah who were denied from entering into mekkah.. Kindly please explain this..!! Since last 8 months I am finding each question's answer which are asked by ex-muslims amd Alhumdolillah i got most of them some of them i need to find out please help me for it..!!