[flagged]
https://pubmed.ncbi.nlm.nih.gov/8008535/
> Abuse was ruled out in 35 cases. Seventy-four children were allegedly abused by other children and teenagers less than 18 years old. In 9 cases, an offender could not be identified. In the remaining 269 cases, two offenders were identified as being gay or lesbian. In 82% of cases (222/269), the alleged offender was a heterosexual partner of a close relative of the child. Using the data from our study, the 95% confidence limits, of the risk children would identify recognizably homosexual adults as the potential abuser, are from 0% to 3.1%. These limits are within current estimates of the prevalence of homosexuality in the general community.
Convictions are a bit of a different story.
https://psycnet.apa.org/record/1995-35375-001
> Using logit regression, it was found that homosexual abusers were 6.79 times more likely to be imprisoned than heterosexual abusers after adjusting for the combined effects of crime seriousness, prior record, and acceptance/denial of full responsibility for their actions.
edit: Your Reddit link demonstrates gay children are more likely to be victims, not perpetrators. LifeIssues.net is... pretty clearly biased.
[edited for clarity: I'm agreeing with the poster I'm responding to in that most child sexual abuse occurs at the hands of hetereosexual abusers, to the point where it's normalized through legal child marriage, which is almost entirely heterosexual, and aren't usually considered in studies on child sexual abuse.]