[dguo]

It looks like the author used Medium's import tool[1] but didn't change the gist links to embeds. The source for the import is a gist itself[2], which just has the raw links.

[1]: https://help.medium.com/hc/en-us/articles/214550207-Import-p...

[2]: https://gist.github.com/citizen428/16fb925fcca59ddfb652c7cb2...