Yes, he did mention that on testing quite a few of his samples lino.
You're a wise man!
I went back and watched all 5 parts, on a couple of the videos he encounters paramagnetism instead of diamagnetism and elaborates on why that is. It was actually a very good series.
Then, I had to watch his video where he plays with ferrofluid and ferroputty... Very cool 8) 8)