I believe if you read my thoughts regarding this, I've never supported him financing her behavior. It's his house, his right to pay for education, his right to tell her to go it on her own with regard to how she finds shelter, food and education. I have expressed concern about not speaking to her.
an Open line to counsel, not preach, to encourage and not judge is going to be necessary. Sometimes these situations are not all or nothing propositions. He must be careful to not entirely shut her out but always have some sort of open door to allow re-entry.
I think it's a tad pedantic to give such cautionary tips. I thing we all know "not speaking to her" is pretty much the colloquial way of saying "she can talk to me any time she likes, but she knows what the subject will be, and how it will turn out if we're going speak of anything else ever again."
Raise your children as you wish, Keyes may do the same, and I will make no judgement on either of you.
No baseball bats or bullwhips though. ; )