1- If you google "chipmixer" ; you can see .xyz in the 1st line. So if someone look for chipmixer on google, probably will be scammed.
If you look for any sensitive website via Google, you will probably be scammed. Google will happily host and promote scam sites, software, apps, and so on, without a second thought, as long as the scammers are willing to pay. Still using Google for anything is the biggest mistake here.
Duckduckgo provides the correct link as the top result.
I'd rate googling chipmixer as problematic for your privacy from the start too. But as mentioned, using Google for anything financially significant is going to land you out of pocket or waste your time. I've seen 6 ads for things I don't want when making more mainstream searches and finally the site I wanted under all that (being the first non ad result).
2- When I tried to click on forum's banner which forum's user signature; a warning appear. But it is directing us to strange link. Not easy to trust with this way.
You can get access to it by downloading the browser from torproject.org or running tails (a Linux distro - I'd recommend using external storage to store your recovery token though if you do that).