There's no way this software is not inherently biased on very basic measures--a lisp caused by a disability probably wouldn't pass muster, nor would a southern accent. But the real tragedy here is that it equates the way someone presents themselves--not the content of their words or the strength of their skills--with job performance. It exacerbates the worst vices of HR and hiring practices and performance reviews. It's an algorithm for superficiality.
This company should remove this product from the market immediately. How this passed off as a good idea all the way through the product development cycle is beyond me.