I guessed correctly what this was about, but then I thought it could also be the name for a group advocating for a formal pillarization of American society (in which different ethnic or religious groups have separate and parallel institutions).
Fun fact: millets originate from East Asia, but have been almost entirely sidelined by rice and wheat. In Japan in particular, it's all rice all the time, and the staple millets (awa, hie and kibi) have been reduced to an occasional component of gokokumai (five grain rice) eaten for vague health reasons.
https://en.wikipedia.org/wiki/Pillarisation
https://en.wikipedia.org/wiki/Millet_(Ottoman_Empire)
For Japanese, ancient china concept = vaguely healthy
Moreso if it meshes well with the quasi-scientific fad of "whole foods"
There's still stuff made (semi-)exclusively from millet
https://en.wikipedia.org/wiki/Kibi_dango_(millet_dumpling)