Hi, your instructions for adding sublime repo is outdated, and results in key being added to legacy trusted keyring when following exactly.
When is this going to be fixed? It’s been like this for ages now.
As you can see in this help section here, your app is one of two made an example of, the other from Microsoft.
https://askubuntu.com/questions/1398344/apt-key-deprecation-warning-when-updating-system
Not a good look.