Re: Not at all surprising really
"Garbage In, Garbage Out", or in this case, racism being fed into AI by means of the training set will lead to a racist AI. Google tried fixing this with some manual tweaks, but it wound up putting diversity in where none existed (e.g. black or Asian soldiers in the German army from WW2).
Even if you don't explicitly ingest racist information, most written works from the last few centuries up until very recently have predominantly been written by white men who were writing for other white men. As a result, the world view of anyone "reading" that written work will have biases inflicted upon them which are very hard to remove.