Earlier quoted context omitted.
Your link went dead. I would greatly appreciate actually being able to read this article.
You can find a working version at https://web.archive.org/web/20170629073046/https://www.quake... The argument is that there's no way to move the whole IRC ecosystem to use TLS (including with enforcement of certificate checks on the client side) and so the security benefits will be radically degraded by patchwork adoption, because if even one channel participant accepts a MITM attack, all channel participants' commu…
Which does not map all cases. Queries are still far from dead. And you don't want to set up a small IRCd for shady things because that might tick off law enforcement a lot more than sticking to some established network whose security you trust.