This is a cool example of how difficult life can be if every figure of speech is interpreted to try and find offense, somehow, whether historically accurate or not.
I agree with sister comment that the English history probably informs the etymology of an English phrase, especially given that the phrase was in use by the mid-17th century, before your timeframe.
https://en.wiktionary.org/wiki/beyond_the_pale
Anyways, that paper scans more like a sociological research piece about data scientists, based on how they write, than an examination of how 'biased' generated speech is or is not, in case passer-bys are curious. Their conclusion is that most papers write about the neat things you can do with a new technique and don't always include a section on societal impact. It's more an absence of politics (I've got GPT-2 ready with your reply to this sentence ;)).
It's also worth taking into account that given their methods involved a bit of subjectivity, what bias did they bring. That said, it's easy to believe lots of papers were like "here's this thing i did!" without including a section on societal impact.
