Hiring teams don’t actually have to interview every single applicant. I was a “hiring manager”(quotes because I effectively wasn’t due to my director involving himself in every decision) for a team that took 8 months to fill a role.
It wasn’t for lack of applicants but because the company as an org was acting like maybe there was an even better option amongst the remaining applicants despite finding people perfectly suited for the role.
I compared it to the family guy skit where Peter chose a mystery box over a boat saying “the mystery box could be anything, it could even be a boat!” to managers in my social circle in other companies and it resonated with them so it didn’t appear to be a rare situation.