A source link to a very thorough article at Tom's Guide (https://www.tomsguide.com/news/home-gateway-geolocation-bh21) is provided close to the top of the page (in the short list). That guide links to the Black Hat presentation.

> For years, turning off IPv6 (IP version 6) was on the long list below, but as of August 2021, I think it belongs here on the short list too. Very very few people need it and it was recently disclosed that there is a possible security issue with it.

I think you're being a bit too accusative. Every suggestion has sources to back it up if you want to see why something is recommended.