Even though the Etsy seller calls it "hand knit" I think it might be crochet. I know nothing about crocheting other than which end of the hook to hold, but looking at the Harmony guide to crochet stitches, I thought it looked like Solomon's Knot.
Yes but it does look knit to me, because I've knit a similar pattern to it. I'm also a long time crocheter. The way it's done is with big needles, somewhere around size 13, and it's got a lot of YO repeats, I'm pretty sure of this.
The Horai pattern is knitted. It appears here in "Random crochet-related chitchat" because I thought the original might be a crochet pattern. LJ identified it and answered here, because that's where I posted the question.