First table, named "Implemented Exchanges".
Re:Blackbird: Bitcoin arbitrage
by mannykannot on Sunday December 24, 2017 @08:10AM
(#15999371)
That table does not make the point raised here, which concerns a specific consequence of Bitfinex being the only exchange you can currently short bitcoin on. I would provide the specific quote, except it is already in the post that you replied to.
To be fair, it does not appear to be pointed out in the readme.md, either.