Real shame - I’ve been a fan and follower since Windows XP and bought a couple of his ‘legendary’ tweak guides for Windows, but the site is closing a lot earlier than planned.
He has selflessly provided a download link of a complete archive of all his work - well worth keeping in your virtual back pocket.
It’s too late to save this site, but you can still benefit from the previous work.
For a bit more background, you could read his site update from 19th October and then 27th October, to see where he is coming from (and potentially going to).
I, for one, am going to be lost without his no bullshit updates and information.