What they really mean: The National Education Association believes that home schooling programs will not provide the student with a comprehensive atheist and pro-gay liberal-humanist indoctrination experience.
Spelling bee successes do not mean an excellent education. This year's contest did not see great success by the homeschoolers in the finals. Not sure about the various state contests. Since most "homeschooling" of difficult subjects is farmed out perhaps we should call it "non-traditionally structured schooling" for accuracy.