Any source for the 2015 case? All I found was executions of pedophile rapists

I think you're right. While the UAE doesn't execute people for pedophilia, per se, the homosexuality element was what allowed for it.

Many traditional cultures don’t really distinguish between homosexuality and pedarasty. That distinction, or at least the cultural recognition of a distinction, is largely a distinctive artifact of the sexual revolution, a western phenomenon.

I don't think that was the case, the executions I saw was for rape and murder of four and eight year olds

Right, my point is that if they were men raping four and eight year old boys, they may very well have been convicted of sodomy rather than child rape like they would in some Western countries.

The state law in Washington even had a similar issue. Bestiality was prohibited by the sodomy statute, which the state repealed in its entirety as a gay rights thing. After the Enumclaw incident the legislature scrambled to re-criminalize bestiality.