They are like politicians being interviewed when they would love to tell the whole truth about their party’s new policy on parsnips or whatever.
Unfortunately, stepping out of line will anger the whips who will then ensure their deselection and months/years of misery and persecution up to that point.
Consequently, they utter platitudes and desperately attempt not to say anything meaningful.
This is self-preservation at its highest.
For some unknowable reason, Keith wants to keep the job and so …