Definitely head-scratching. According to the ESPN article, "The top 16 will be provided in alphabetical order". Hmmmmm....
I'm guessing the utility of notifying a day earlier would be so that host teams can start reaching out to local hotels to secure rooms for three yet-to-be-named teams that will be visiting for the first two rounds. Getting a day's jump those teams' fan base increases the likelihood of host teams being able to secure appropriate space in a single hotel for each respective visiting program.
I would imagine the logistics of finding enough rooms for players, coaches, support staff, cheerleaders, band, practice squad, players' parents, etc., could be quite daunting/frustrating.