I will be publishing a careful analysis of the shortcomings of that post very shortly.
You may recall that one poster digged into the quoted NIST "down conductivity vs Density data" and published that only one of the NIST data points (332) was Duck down. (333) was Turkey Feather Fiber, (353) was 50% chicken and 50%turkey,
(354) was #353 compressed, (355) was 100% chicken feathers, fluffed, (356) was chicken feathers compressed 0.6 inches, and (357) was chicken feathers compressed to 0.3 inches.
These were termed mixing apples with oranges and little real relevance to the goose/duck down story and as a result Nisely wisely retracted these data. Read further down the post for this retraction.
Since I am the poster who pointed out this significant data inconsistency and caused the data withdrawl by Nisely, I conclude that I am familiar with this issue of down compression. If you read your cited page for comments by other than Nisley, you will see that.
Today, in another post,(A New Topic) this announcement of the "Extraordinary Claim" will be looked at for "extraordinary data" that supports it.
Please read these postings on the "extraordinary Claims" carefully before you buy into the "Extraordinary Calims".
Some of the best tools of the scientific world are the ability to debate and argue and cause the generation of ever improved data and data that fills in the missing gaps, and the elimination of data that technically doesn't belong in the discussion.
My upcoming new post will be intended to eliminate data that doesn't belong, and to keep emphasizing the lack of "extraordinary data" to prove the "extraordinary claims".