I don’t see any discussion on performance of the models…

You can always start one 😁

Did you measure any performance metrics? Its standard to do that when writing about an ml project.

They don't seem to claim "we have a dataset of typing logs from DIFFERENT people working on DIFFERENT tasks while typing on DIFFERENT keyboards".

If they had it I would be more concerned about the ethics of data collection than about the model accuracy

Really interesting idea

Thanks for reading!