That guy left the board and robowaifu network for complex reasons which I'm sure no one wants to discuss here (again). If you or anyone else knows about how to train such networks or someone is willing to learn it, then it should be easily reproducable. There are enough resources on the web to learn about how to do that, assuming one has the time, nerves and brains to do so. The ideas of the anon which left are also in some of the threads here, so you can look at that. Again: How to get started with GPT2 or building something better is certainly covered in some forum which focuses on that topic. For all I know, no one here is currently working on something like it.
Talk2Waifu was no AI, only a text generator. There is no AI available which is close to a human anywhere. This has to be build first anyways. A text generator is also not a chatbot, he only used it as such, or as input for one, which might even not be a good starting point.
We have plenty of threads here where you can participate:
AI, chatbots, and waifus >>22
Robowaifu Psychology Thread >>2731
(Robo)Waifu personality thread >>18
NLP General >>77
Datasets for Training AI >>2300
The Language Problem >>6937
Wifu that gives you Hope >>107
AI Software >>85
Can Robowaifus Experience Love? >>14
AI Design principles and philosophy >>27
Robowaifu Fail-safety >>1671
Mycroft: Open Source Alexa >>402
Downloadable AI for robots? >>244
Robowaifu-OS & Robowaifu-Brain(cluster) >>201
Getting a good AI will take more time than getting some options for bodies developed. So it's better to focus on that and on the low hanging fruits around AI and chatsbots.