I understand what Mr. Lukiwski means, but when I read the French version of paragraph 17, I really think that he shouldn't worry too much. Indeed Mr. Cappe said very clearly that the government needs a certain degree of confidentiality. It must however show judgment in determining in which situations it can deprive Parliament of certain documents.
I find that paragraphs 17 and 18 really reflect Mr. Cappe's testimony. In fact, he is quoted verbatim in paragraph 17: “Good government requires openness [...], but good government also requires secrecy.” I think that he agrees that a government also needs to be able to keep certain things secret. In paragraph 18, he qualifies his statement, saying that when a bill is made public, secret and confidentiality no longer apply.
I am of the opinion that paragraphs 17 and 18 really reflect the spirit and nuances of Mr. Cappe's testimony very well.