I haven’t seen or heard Trump deny any of it. Now one thing everyone knows about Trump: He is not the shy, reticenct type. He is loud, abrasive and quick to hit back at the slightest slight. He’d have come out and denied it long ago if they were telling lies about the meeting.
Because you are uninformed and are trying to change the topic from Cruz. The Dreamers admit that they 'crashed' the meeting, then claim that Trump "lied" to them, putting them at ease, only to refute them immediately after the Buzzfeed article. I've heard him explicitly on this issue deny their claims, saying he was "polite" to them, but that was the extent.