I tried to find an article to link it but couldn't. Anyway it was analysis of Andy Reid's timeout usage this season.
Basically it said when the CHiefs have called an offensive timeout this season which was the vast majority of their timeout usage, the next play resulted in a 1st down or score something like 81% of the time. Far and away the best in the league.
Edit: Found the link
https://www.arrowheadpride.com/2019/...d-theres-proof
Edit:link was broken, fixed now