Sections Code Snippet Updates for One Page Version?

Wasn’t sure if I should post this on these forums or as a comment on the below-mentioned link, so I chose here.

I am trying to create a new site to promote a book I wrote, and found that a single page website is ideal vs. the blog-style. I like Customizr’s flexibility, and I found this code that seems to provide what I need: https://themesandco.com/snippet/adding-sections-to-any-page-or-posts-in-customizr/

However, the notice says it may not work with Customizr 3.2+ (which is now version 4+). Are there any updates to to this? I’m not a coder and thus the hooks/actions still confuse me a bit.