Wheat contains FODMAPs. I can't remember what kind exactly, but they're there. So it's actually kind of hard to eat gluten without FODMAPs, unless it's seitan or something. Hence the abstract of the article states:

"Foods with gluten often contain fructans, a type of fermentable oligo-, di-, monosaccharides and polyols"

https://www.verywell.com/wheat-and-the-low-fodmap-diet-19447...