There's a class difference here not reflected enough in the point spread. 

Long Beach State was 6-12 last season. It was a chaotic year for the Beach. COVID-19 wreaked havoc on their season causing the team to miss nearly a month. Long Beach State also had a number of close losses, which makes their record look worse. 

Idaho is one of the worst teams in the country. The Vandal were 1-21 last season. They ranked 338th in adjusted offensive efficiency and were just as bad on the defensive end.

Long Beach State has a number of returning starters. Idaho doesn't. The Vandal lost their only two double-digit scores from last season.