Exactly. While the article makes very good points about what you want from a general-purpose Git deployment script, deploying to App Engine is not quite the sam

Exactly. While the article makes very good points about what you want from a general-purpose Git deployment script, deploying to App Engine is not quite the same, since there is no Git client on the server pulling changes directly, so you avoid the problems addressed by all four points. App Engine creates new app instances when you deploy, so there's no need to care about deleted files, tracked/untracked files on the server, and so on.