I also watched this interview this morning and I saw nothing that was overtly political. If the political choice is to have nuclear weapons the CDS will support it. If the political choice is not to have nuclear weapons then CDS will support that too.
Where a military man is entitled to speak is on the effectiveness of a deterrent if you tell people you will not use it under any circumstances. I thought CDS spoke wisely. He could have gone further and spoken of the deleterious effect of having any politician taking such a stance as it would undermine the deterrence value for future leaders too.
Doubt and muddling are best avoided when nuclear weapons are involved.