To me it seems that this offers only syntactic sugar over this.setState. No other advantage. And the cost is high: injecting a lot of magic from <a href="https://nx-framework.com/" rel="nofollow">https://nx-framework.com/</a> in your components.
Brief summary (from the repo):<p>Easy State aims to make React's state management simpler without adding new syntax. To achieve this it makes the following modifications.<p>It replaces React's setState() with plain native JavaScript.
It auto binds your component's methods.