Is it too good to be true: Yes it is. Now you can manage a full site with just few files without any database. Its called a Flatfile CMS and the popularity of wordpress is going to drop because of them.
What is Flatfile CMS:
A flat-file CMS is a content management system that stores content in files and folders rather than in a database like a traditional CMS. A database-driven CMS needs to query a database to retrieve content but with a flat-file CMS the content is readily-accessible in a simple file and folder structure. This might sound like you can only create basic sites with limited functionality with a flat-file CMS but that isn’t the case