Hi @Rodrigo,
Thanks for helping!
I started over from the Codrops demo because, contrary to what I said before and after giving it a closer look, it's working pretty great when I resize my window and it achieves what I'm looking for:
https://codepen.io/deodat/pen/eYQXrOY
there is no resize event in it, nor revert of the GSAP Context instance.
Maybe I've missed something with my CSS.
I'm going to investigate a little bit more, correct my first pen, and, hopefully, I'll be able to show the result here