Watching half is not equivalent to not watching at all. You embellished a little there. And the transcript is available.
I embellished a little?? I suppose you could interpret it that way, if you want to be his apologist, but he said he turned it off half way through.......and that is NOT watching the speech.
To paraphrase your own quote.....watching half is NOT watching all.
Ya think he read the transcript, though?? :o)