That is Goldberg’s point exactly. He has put his finger on the inconsistency of Keynes’s modern opponents. They want to make it off limits to correlate his values with his value system when it is simply natural — and hugely explanatory — to do so.
Not Keynes's modern opponents but his modern defenders.
I agree with the above posters. These homosexual apologists want to make criticism of Keynes’s economic theories off limits because he was a homosexual. This is non-syllogistic reasoning - not that there is anything wrong with that.