You're right about the company. It's full name is 科大讯飞. 科大is short for 中国科学技术大学(University of Science and Technology of China)，my Alma mater!--this company is founded by several alumni in cooperation with the university.
TTS is not difficult for 科大讯飞, and they put their effort more on speech-to-text engine. But they have open source packages for both TTS and STT, and a whole bunch of other cool stuff. Actually, they have been there at least since 2014. You could find them here (all-Chinese site): http://www.xfyun.cn/sdk/dispatcher Their TTS and STT support A LOT of dialects.
Alternatively, there is a Chinese TTS on Github: https://github.com/yantze/vim-tts It also supports a lot of dialects, including Sichuanese.