I like articles like this. It’s no way saying “you should replace GSAP” but more “hey, check out what you can do with CSS now” and hell yeh, check out what you can do with CSS now!
I’ve only half been keeping an eye on the new CSS scroll animation stuff. I always wait to see content like this one show up, where I understand the starting point (GSAP), which helps me then see how the end point works (scroll animations).