If you look at Para 20 Manning states "De Graf was reluctant to...

If you look at Para 20 Manning states "De Graf was reluctant to talk about GDY, why he left or why he was pursuing a different type of technology"
I think it entirely proper to be reluctant to discuss in detail the fortunes of one's previous employer or one's reasons for leaving.
In para 21 DG gives I believe entirely proper answers re GDY but more importantly he explains why he did not pursue HSA with GDY. What more does he need to do?

IMHO the article is a beat up.