Coffee vs caffeine makes you poop

Why does coffee make you poop but caffeine pills don't? "whether the coffee's caffeinated or decaffeinated doesn't seem to matter in all studies, according to other research -- suggesting that, in some cases, coffee compounds besides caffeine might be responsible for sudden bowel movements." https://www.cnn.com/2022/04/04/health/why-does-coffee-make-you-poop-wellness/index.html