Its a great way for miners to launder money. Bitfinex pays the fee and it turns up on the miners balance sheet, where does bitfinex gain?
From the article.
And as said, given previous dishonesty from Bitfinex about all sorts of unrelated parties (they claimed to be independent of Tether, until that was proven a lie, and they are heavily intertwined with their bank, Deltec, who says that they have "insight into every transaction and Tether"), I'm going to consider Occam's Razor, here.