The implication (representing a belief, not a claim) was about the nature of item purchases on .onion webshops (that they're primarily contraband), not about the composition of .onion or Tor traffic. If anything, the attempt to pivot to that was a trick.
You may still fault me for mixing in beliefs into an argument, it is of poor form from me. Up to you. But then I don't think sentiments are just pure hard logic and evidence, so it'd have been potentially more dishonest from me to exclude it than to not.