I'm the author, good to see this on HN, raising awareness on the topic
I don't know who made the translation and when it was made, but the original article in french (https://pixeldetracking.com/fr/google-tag-manager-server-sid...) contains more information on recent GTM "improvements"): mainly on how you can easily change JS library names and detailed instructions on how to host your container in other clouds or self-host