IMO this stat is being a bit over-used.
Yes, he did not beat a ranked team. That is a disappointment. But, Texas finished the 2019 season ranked #25 (whom Baylor beat on Nov. 23 that year) and Baylor was a field goal away in OT with Oklahoma. And that's all after the fact he took over not only a program in disarray, but started coaching at a university in disarray. Imagine what it was like having to recruit to a place with all the crap they had going on.
Winning matters, so I won't disregard the statistic completely. He'll need to prove himself here. But, the fact he didn't get that particular achievement unlocked at Baylor doesn't hold much weight with me in terms of the immediate goals and needs of the program.