There is actually a plugin called REST: http://struts.apache.org/docs/rest-plugin.html

If that's the plugin that was affected, then I think the author did nothing wrong. What would be the point to explain what REST - as a concept - is, in a non technical article.

Remember this the next time you read anything in the news about an industry you don't understand.

The Gell Mann amnesia effect - https://seekerblog.com/2006/01/31/the-murray-gell-mann-amnes...

The irony here is that the plugin is actually called REST plugin

http://struts.apache.org/docs/rest-plugin.html