From an article:
“To determine a replacement for Marshall, it came down to sifting through a ranking of NCAA APR scores of teams that finished the 2024 season with a 5-7 record. Top of the list were the likes of Cincinnati, Wisconsin and Air Force, but the committee ultimately landed on Louisiana Tech, who landed 16th out of 17 teams among the group. “
Almost certainly it was proximity to the bowl’s Shreveport, LA location. The rules about 5-7 teams probably only apply to the initial selection process. This way the bowl got to choose whomever they felt was going to fill the most seats on 2 weeks notice.