It is not accessible, or at the very least makes no statement about accessibility. Also, pretty much the single major issue to any new GUI to be honest, so everyone should always bring it up first thing. You have to be able to use an interface.
I have a habit of turning on NVDA, Android Talkback, etc. quite frequently to test when I'm working on a website, but even then, there are big differences between screen readers and a blanket statement of accessibility is completely worthless. People frequently tell me that something I tested on several Windows/Android devices doesn't work on Voiceover despite following the relevant standards. It's like browsers in the IE6 era, you need to explicitly test with as many as you can. And yes, it sucks.