> TTIP was negotiated in secrecy (as all trade agreements are)
That seems like a really steep assumption to try to start a conversation about changing perspectives with time. He opens with a purported tautology about how you must do trade deals, which I feel hurts the argument against moving goalposts - because that seems like the exact kind of sentiment that leads to the behavior in the first place. This has always happened, thus it must always continue to happen is rarely a way to start productive dialog about something.
You can even see the discussion of CETA spawning a long, subsidiary thread which distracts from the central thesis which we should be arguing about. (I am not offering an opinion on the content of that discussion.)
It should be no surprise that if you make a post trying to talk about the meta of controversial topics, that if you start directly citing said topics the discussion ends up being a debate about the controversy rather than the original intent.
"_Not_only_was_it_already_a_much_improved_agreement_from_ the_start_,but it kept being modified from the initial public version of it to the one that was finally sent to national parliaments."
Either the writer of this is an expert on the topic, well-known in the field and the weight of this judgement on its own is a valuable primary source; or, the writer is referring to such an analysis conducted by other experts but has not bothered to include a citation/link; or, the writer has their own critique but instead of presenting _that_ has just stated an opinion which they know to be controversial.
All of the above possibilities contribute substantially to the noise around any discussion.