I watched the video (because I hate myself) and I agree, more of those throws were there than I realized live. The majority of snaps I think Arch gets to the (or at least a) correct decision and is just late. It's reasonable to expect that anticipation to develop with time, though maybe more like next season than next month. In that sense I feel a little better. A few really were just brutal unforced breakdowns though:
Obviously the first pass of the game. Gets spooked by the pursuing defender and short arms what was schemed for an easy 20 yard game right off the bat. Game in a nutshell.
On the 4th down throw to Livingstone in the endzone, he's got Wingo on a slant on a designed pick play. Guaranteed first down and potentially a TD if Wingo gets some momentum. Instead Arch chooses the higher degree of difficulty with the deep out - actually thorws a decent ball but it's well covered and Livingstone can't quite make the play.
Both third down drags to Wingo, the one in the red zone and the one on the last drive. The latter definitely worse. Just late to make the throw and pressing resulting in unnecessarily bad balls. Hugely consequential unforced errors.
INT - Now we can't see the pattern in the TV view, but as mentioned below Arch turns his back to the defense on the play fake. The throw to Wingo is there if it's dropped over the DB and in front of Wingo. Tough catch but the DB can't do anything about it. Very possible Arch is late allowing the DB to close on what would have been a huge play if thrown on time.
It seems to me the root issue for a lot of this is the composure and anticipation that comes with experience. He's been clunky with touch and timing in the short/intermediate game every time we've seen him at Texas though. While I obviously expect him to play better over the course of the year, if it looked like that coming out of fall camp, I don't expect it will improve enough to really stress the better defenses on the schedule, and Texas will see some more struggles in the passing game. Unless Texas is able to just dominate games with defense and running the ball there could be several stressful, ugly rock fights and a few more Ls in store.
Side note - man, Endries had a really nice game. He is faster than I realized, faster than helm and maybe even Sanders. He should have a great year.
I think this is absolutely the explanation of that stat.