> could be understood as slightly hyperbolic

Of course, you're right. I didn't intend to criticise him.

I just think that it's not a good idea to transfer this megatrend to healthcare.

Yes, those systems can be highly accurate, but as we all have experienced, this is not a stable or consistent property. A very good model can give you an ingenious answer one minute and an utterly dumb one the next. My guess is that it's simply a consequence of the extremely high complexity of the 'plant' (natural language, language interfacing with the real world), leading to some highly non linear behaviour.