Publishers will be rushing to switch on Kindle TTS permissions, which will negate much of the clause.
The only real loophole in class 6 is "screen readers that render the text into a specialized format", but that is a
very large loophole. All you need is a screen reader that only uses a 'specialized' format that the book isn't sold in and you're covered. How much are
Rocket eBooks selling for these days?