This is cool, but it has some inherent biases. If you type only "Trump", it suggests that there's a 42% chance that your comment could be perceived as toxic. If you type only "Clinton" there's a 14% chance.
That being said, I think there's some huge potential to use AI/ML in this way to improve our ability to communicate less toxicly. I've seen some research from Google investigating biases in AI/ML outcomes, so I'm excited to see what develops.