Every piece names its sources. Where we relied on somebody else's estimate, we say so, and where we did the arithmetic ourselves we show it.
The advice is to show who wrote the thing and why they would know. I went to see who actually does it, and the split runs along a line nobody talks about.
Every content audit template has a line for freshness. I went looking for where that freshness is actually published, and found it is mostly published to robots.
Publishing a date is table stakes and nearly everybody does it. Saying that something changed is a separate field, half of these teams do not emit it, and it is the half that matters if you ever refresh anything.
I assumed word choice was what made writing read as machine-made. Sixteen scored rewrites later I do not believe it, and the ranking surprised me.