This seems to be ignorant about what the law actually says on cookies.

Some of the examples of why you need a cookie prompt are false.

Cookies that are used to provide expected functionality (e.g. log in session cookies) do not require a prompt.

This script will show a cookie notice much like a lot of big sites by Google Inc and many other companies. It doesn't manipulate cookies or deletes them, etc. The purpose is to implement a cookie notice and nothing else.

Indeed. I would not use this, it is not GDPR compliant.

I wonder if it's just outdated, or based on wrong information.

uBlock Origin straight up blocks the script.

Most likely uBlock has been installed by you so you gave a third party app to decide for you what the web-pages you visit should include or not. I would not use uBlock, that script doesn't include any tracking so uBlock blocked it wrongly.

I'm uncertain if you're trolling or if you're actually that naive.