Highly recommended listening.
As a neuroendocrinology researcher, much Robert Sapolsky’s life work revolves around the questions your pondering on. He has spent years studying wild baboons in Kenya, “ .. specifically, Sapolsky studies the cortisol levels between the alpha male and female and the subordinates to determine stress level.” [2]
[1] https://podcasts.apple.com/au/podcast/the-peter-attia-drive/...
1 - https://www.amazon.com/Fat-Switch-Richard-J-Johnson-ebook/dp...
2 - https://podcasts.apple.com/us/podcast/rick-johnson-m-d-metab...
While your interpretation seems to be that using the different test brings these wild results into question, this discussion seems to conclude that, yes, it's a different test, but no, the results are no less concerning.
Take a listen for yourself!
https://peterattiamd.com/davidlight/ https://podcasts.apple.com/us/podcast/the-peter-attia-drive/...
https://podcasts.apple.com/us/podcast/the-peter-attia-drive/... https://peterattiamd.com/davidlight/
https://podcasts.apple.com/us/podcast/the-peter-attia-drive/...