I have a few comments.
Ross, despite his education, seems startlingly unable to recognize sound logic.
Now, it may just be that I'm unfamiliar with the term 'principle of positive fact, but what I see is this:
"Through the principle of positive fact, if the universe has a beginning, it must have a beginner, hence the existence of God."
1. All beginnings have a beginner.
2. The universe has a beginning.
3. Therefore, the universe has a beginner.
4. That beginner is God.
The first premise requires a little elaboration, and there is an unjustified leap of logic between (3) and (4). Still, it's clearly just a basic rephrasing of the age-old cosmological argument. Premise (1) only stands if by 'beginner' Ross means 'cause.' For instance, if I say 'since an avalanche has a beginning, it must have a beginner,' I am only correct in the sense that something triggered the avalanche. 'Beginner' implies someone, which is, at best, something Ross overlooked, but more likely just meaning-laden language used rhetorically in an irresponsible fashion.
While there is still debate over the validity of the cosmological argument for a creator (which I won't bother detailing right now, but will direct you to a useful description here), what is certain is that to say that 'the universe has a cause' is NOT the same as saying that 'it has an intelligent, thinking, planning Cause.' All we know is that a series of events caused a beginning to time and space - as we know it, in this universe. The leap from this conclusion to 'thus, God' is unwarranted. It is at least unsatisfactorily explained in the presentation.
"Any entity confined to half of the line of time, must have a beginning and must be created. I can walk home tonight, and that's it. It's the simplest, most rigorous proof of the existence of God."By way of counter-example, here are a few other options for an entity confined to half of the line of time (only able to move 'forward' in the dimension of time we experience):
1. The entity was, at one point, able to use any line of time, and has since lost those abilities.
2. The entity existed outside of time, and then became subject to that dimension (Jesus Christ, as Ross must have forgotten)
3. The entity was brought into existence by non-intelligently-designing factors.