Technically, "greater" is more correct, but from the user's point of view, sharper means a smaller angle.
I would try to rewrite it to take both points of view into account.

@Aaron Carlisle (Blendify) - here we simply mean the angle between face normals, you can see its value when enabling "Edge Angle" in Overlays.

float no[3];  /* face normal */

const float threshold = cosf(bmd->bevel_angle + 0.000000175f);

if (dot_v3v3(l_a->f->no, l_b->f->no) < threshold) {

Thanks for the clarification, the documentation can be updated to reflect that should be the angle between the face normals.

The tooltip could also be expanded here to better convey this information.

Updated in rBM8485

Updated in rBM8485

That looks good to me, thanks for updating the docs :)