Russ was still of this opinion just a few weeks ago. In youtube thread he was arguing that small particles have a larger "density to volume ratio" and so are heavier for their size than the same material in larger amounts.
He was confused when it was explained that density already is a mass to volume ratio and thus can't rationally be included in another ratio to volume. He eventually started to claim that his density to volume ratio claims were a typo even though he includes the same ratio concept on his webpage to justify the fast falling particulate claim.
Hopefully suggesting it was a typo indicates he has realised his original misconception and will revise his thinking somewhat.