Hi, original author here. Maybe I wrote it a bit misleading. The thing is: It's independent of the editor. Even if you use an editor that _does_ support conflict handling you can lose the content.

Just assume you write something, save, close the editor and never open it again. iCloud might replace the content of that file and there is no way for you to know.

The only way to prevent losing your data is setting up a Git repository or open _every important file_ regularly in an editor that supports conflict handling.