There's two issues there.
One is that that's fraud. They are getting federal funds for children not actually enrolled in the schools. How do they report their progress and grade advancement? Do they accept what the homeschool parents report themselves? Plus the fact that they are taking advantage of, and using, the homeschoolers without their express written consent to procure funds for the school.
The other thing is, if they do count them and receive money for them, are going to be handing them a diploma upon *graduation*? If they're taking credit for their education for the $$$$'s, then they ought to do them that courtesy at the least.
Our school district requires us to have an evaluator go over a portfolio we prepare. Then they inform the school district whether they approve or not. They check standardized test scores and coursework.
I am not sire about the graduation stuff. We are very far away from that.