all Falloff in C4D 20 is done with Fields (basically a movable separate object for the falloff), you would want to put in a Spherical field to follow the tutorial.
Here is the simplest intro to fields I've seen so far https://lesterbanks.com/2018/09/c4d-r-20-fields-introduction/
this one seems pretty good too
Quite confusing at first but I seem to have gotten the hang of it pretty quick and got the desired effect! Thank you so much! Was looking for an explainer video but clearly wasn't looking in the right place lmao