Wow. I had not been aware of that. I’m kind of surprised to see this has never been done before in NFL history, even in the days when they played fewer games and rarely attempted passes. Congratulations?
The NFL only started tracking interceptions in their statistics in 1933 (the league was founded in 1920), but even so, it was still absolutely a run-first league up through the '50s and '60s.
Yes, teams passed less often back then, but when they did pass, it was typically longer passes, and interception rates, generally, were a lot higher than they are today.
And, yes, it’s true, no team since 1933 had gone an entire season without making an interception, until now.