Hey twosevenths , thanks for the reply! Apologies for my late reply by the way!
I indeed think the knowledge base article is outdated. Sorry about that! We'll make sure these will be updated soon. I also think that Google Analytics 4 unfortunately does not work correctly with Buttonizer at the moment. I have added this high to our to-do list and we will pick this up soon.
Currently we are working on a revamped version of our WordPress plugin so it supports our Standalone version which will probably be released next week (version 3.0). In a few version later we'll introduce our own privacy friendly click and visibility-analytics by the way, so analytics are really high on our list.
I'll update you as soon I have more information.
Let me know if this helps or if you have any further questions/feedback left!