Hells Bells, I'll even allow input from the unwanted to solve this riddle.

Preface- If the steelers lose to the bengals today. I believe pittsburgh would set a record(4) for consecutive losses to end a season and still make the playoffs.
Now granted, they kinda got schedule hosed with 3 games in 11 days vs 3 juggernauts. Its deserving of an astrisk!

12-15 @ Philly.
When philly was still battling wa for div.

12-21 @ Ravens.
Division lead deciding moment a few weeks after pitt won the 1st match between these rivals.

12-25 hosting Chiefs.
Chiefs clinched #1 seed with the w.

Now- Week 18. Knowing that Ravens clinched div title womping Clev(assumed). The steelers are facing the Bengals at home. Steelers the home dog +2.5. Bengals playoff hopes live or die on the result.

And therein lay the question. Would a 4 game losing streak- backing into the playoffs- set a new dubious record?
Google setves me up c apola. Redit, Quora and other such numskull- fact challenged shat-sites.

I believe. The vikings have backed in a few times. At minimum on a 2 game lsing streak. Id imagine quite a few teams have that many losses at the end. I think the vikings too have lost 3 straight to complete a back-in one and done playoff year. But has anyone gone 4 straight losses prior to the playoffs? 5?

I honestly font recall. O-u-a time i used to rember such insignificant trivia. These days I can bately remember when I last bathed. Ha(jk)

No smack.
Just the facts ma'am.