The sample is spun worsted, which means with a short, forward draw, or inchworm style. As the yarn is moved up towards the orifice, you slide your fingers down it, towards your fiber-holding hand, pressing the air out of it. This makes the yarn denser, sleeker, and more durable. It also maintains the incredible shimmer of the silk.
I have tried spinning this fiber long draw, or woolen, and the result looked like straw, so I knocked off that noise pretty fast.
(My boyfriend calls the first picture “Slab o’bacon.” Mmmmmm….)