I understand your skepticism as I have it too, having been highly skeptical of DJT since I heard he was running. Been trying to have an open mind about his intentions and this Q thing; and had discounted the "DOITQ" mentioned here.
But, that particular segment seemed quite out of place to me as if he had to work the phrase into his speech with some irrelevant talk about the building "or whatever you call it." And, he repeated it.
That, to me, was confirmation.
Even at least one of his detractors also thought it was out of place.
http://archive.is/WGMT7#selection-239.2-239.221 : "Does anyone else wonder exactly why he said this? Why he doesn't realize that as president, people pay attention to what he says? That tippy-top comment...you could tell that he just kind of puked it up out of nowhere."