MCR frontman Gerard Way told Billboard:

To me, ‘Destroya’ is [a] really strong art piece on the record. Again, much like ‘Summertime,’ it really started with drums. There’s a lot of songs linked by the drum on this album, and ‘Destroya’ was really inspired by [the Hindu] Holi festival in India because it was relevant to the project. I watched a lot of video of people on YouTube of people performing in the street during the Holi Festival. What you’re hearing in the beginning of the song is about 10 seconds of these street performers that I had heard and tried to recreate. It’s a song that everybody got to play the drums on, and it’s probably the hardest song the band has ever done. The song treats religion almost as a superstition, or questions its existence. I paid close attention to organized religion and the caste system – and any religion that would put its foot down on people to keep them at a lower level.

Wikipedia is a community-based website, so generally speaking, anyone can write anything. Jimmy Euringer most-likely did not contribute to the track. It is rumored that Jimmy was supposed to play Show Pony in a music video, but it is unknown about the track itself.

Jimmy was featured as a draculoid in both the “Sing” and “Na Na Na” music videos.

That being said, it’s still possible that he did backing vocals. But as far as I’m aware, he’s not credited in the album.