I'm reading the thread title as the song's racism is a foregone conclusion.

Acorn: as discussed by many above - if driven by historical accuracy, with such an immense store of songs to choose from, what is the reasonable excuse for actively choosing to perform the songs that are likely to be considered racist by many (most?) contemporary audiences?

I've not seen any evidence shanties and naval science were ever in the same room, alone or together. Ergo, I would introduce your predetermined 'scientific' findings and facts as pirate opera. ie: Not science.

The most blatantly racist (by any metric) maritime work song sub-genre also being far-and-away the most African/African-American/Caribbean sourced & influenced; used primarily to enhort and exhort exceptionally diverse cohorts whilst being deliberately/ignorantly hurtful & offensive to its own creators & practitioners. Oy.

You also have never used “celeusma” in a sentence, have you?