there is no possible method for counting unused addresses anyway.
unless the address is used, it doesn't appear in the blockchain.
Good point. That invalidates his claim right away.
the only way unused wallets could be miscounted like that would be if a webwallet did so, but you'd be unwise to believe any such unverifiable claims made by webwallet sites, they're pretty heavy on the "marketing rhetoric" (i.e. bs), as you would expect
That reminds me of how exchanges and other services boasted about how many account registrations they had in the last x number of months. One can register an account on even the most compliant exchange, but without verification the account itself is pretty useless. It's a metric that can be manipulated easily, either unpurposely or purposely.