Sounds like bitterness to me.
Among other things, the program was created to, ultimately, promote the success of the national team on the international stage.
It has delivered World Junior titles, U-18 titles, and a significant number of the players from the young, overmatched, overachieving Olympic team that split with Team Canada and won Silver were NTDP graduates. Players coming through the program grow and succeed at the highest levels.
I'd say it is doing exactly what it is supposed to.
Whether a Gretzky or similar superstar comes through really depends on the ability of the US to recruit and develop that kind of athlete; right now those athletes aren't playing hockey. I do agree that there is a good chance that such an athlete may wind up playing major junior, though Pat Kane did both.