1) No
2) It's not new law. The law is from 2000. You can diff these two for the new bits
original: https://www.legislation.gov.uk/ukpga/2000/11/section/58/enac...
new: https://www.legislation.gov.uk/ukpga/2000/11/section/58
3) Stop reading the shitty fucking register, because it's misleading you.
Instructions on how to build a cruise missile would seem to fall under that. So do you have a slightly more helpful answer. Whether it is from 2000 or 2019, seems irrelevant.
>Obviously the goal of this website is not to provide terrorists or other nefarious types with the plans for a working cruise missile but to prove the point that nations need to be prepared for this type of sophisticated attack from within their own borders.
>A detailed level of documentation will be provided to those who qualify and are willing to pay a small subscription for full access to the project diary.
Recurring payments do not work well with suicide bombers and alike. You've got to be careful with this.
That would apply to a guide on how to browse the web and use Google, wouldn't it?
This and it's ilk are basically "because we don't like your face" catch-all's.
Sadly the UK is good at those to whit - The Anti-Social Behaviour Order (defunct but lastesd from 98 to 2015) which made previously criminal behavior a civil matter.
We are a curiously illiberal liberal democracy.
https://youzicha.tumblr.com/post/166323190559/documents-bann...
Anyway the page has disappeared but can be seen on the Wayback Machine. The page itself seems not to contain any information that would fall under that legislation but perhaps some of the links it contains might.
As it is in the Wayback Machine and that is mirrored I wonder if the mere existence of the mirror would be enough to expose the hosting entity to a risk under the UK legislation.