My high school teacher taught our class a lot about biases in historical sources, when reading a source you have to critically analyze who the author and recipient were, and their motivations. That lesson still applies in the age of LLMs as a filter of knowledge, if you ask anyone to summarize a historical event, they color it with their own subjectivity - human or model.

Anyone who tells you history is unbiased is either lying, or a propagandists standing by with a pitcher of Kool-Aid.