I get that Haliburton and THT are young, and have potential, but so do like 50 other freshman. Monte Morris was really young as a freshman, and was a much better player than Haliburton, and there was never even a thought of him getting drafted. THT I could see a little more with his skill set, but I have a hard time believing a 6'3" shooting guard with average athleticism by NBA standards who shoots 25% from 3 will be a first round pick.
The biggest surprise to me in those draft projections is Ja Morant and Jarrett Culver going ahead of R.J Barrett. Neither of those guys are freshman by the way.