If you read the article, that's an option with Github's code spaces setup.

> Visual Studio Code is great. It’s the primary tool GitHub.com engineers use to interface with codespaces. But asking our Vim and Emacs users to commit to a graphical editor is less great. If Codespaces was our future, we had to bring everyone along.

snip

> From there, GitHub engineers can run Vim, Emacs, or even ed if they so desire.