Why in the world would an online article not include a short gif or an embedded video showing the bowling technique? Is gq.com primarily a print medium?
Having just watched a clip of it, I'm very skeptical of this remark.
Yeah, technically you might still name levels of expertise below "expert" that would clearly see the difference, but that's not how the term is colloquially used. From the baseline perspective, shades of expertise are experts-only. In any field.