No, because as you said it "does NOT contain fact-based details" therefore it is not reliable. If something doesn't contain fact-based details, it isn't reliable.
I believe it was a final act of mercy, i could be wrong but.....
Moderate means D- to take on a serious mode.
The writer used the word 'moderate' to make a comparison between those people who would lead a serious life without any excess with the group of people who would do whatever they wanted to fight against the Black Death.