At one point subtitles written in pseudo Chinese characters were shown; I can send a screenshot if this is useful.
The latency was slightly distracting, and as others have commented the NVIDIA Personaplex demos [2] are very impressive in this regard.
In general, a very positive experience, thank you.
[0] https://en.wikipedia.org/wiki/Phonological_history_of_Spanis... [1] https://en.wikipedia.org/wiki/Phonological_history_of_Spanis... [2] https://research.nvidia.com/labs/adlr/personaplex/