[Wonderfall]

There is literally a link in the article that takes you to the Debian website: https://wiki.debian.org/Teams/Apt/Spec/AptSign

I might rephrase that since they didn't technically moved away from OpenGPG (yet). It was a proposal at the time.

[Wonderfall]

Sorry, of course meant GPG, OpenPGP being the standard on which GPG is based on.