Giving one example is not an evaluation that would convince me that NN are better. The German LaTeX community is one of the largest and I haven't heard much about it being unhappy with TeX's hyphenation.
To be fair, in day-to-day use problems like these will be corner cases as to my knowledge LaTeX tries to avoid hyphenation and even if it has to split a word, it has a good chance of getting it right. Also, to me this project's focus was more on learning about neural networks than creating a better hyphenator.