I rarely use mixers and the only one I have used in the past was whirlwind.money so I doubt I'd easily fall a victim for this site.
As per the site they are relatively new and not even up to two months yet according to whois.com
Domain:mymixer.io
Registrar:Hosting Concepts B.V. d/b/a Registrar.eu
Registered On:2023-04-14
Expires On:2024-04-14
Updated On:2023-04-19
Status:clientTransferProhibited
Name Servers:scott.ns.cloudflare.com
keira.ns.cloudflare.com
https://www.whois.com/whois/mymixer.ioAnd for new sites it's hard to come across any bad reviews since all the review you'll see are paid reviews or those testing the site and a new site with bad motive will always serve those reviewing their site well so there could get more people, I will continu my search to see if I can find more information about the mixer.
Edit
I just went throught their Trustpillot reviews and for a site that's still new to have recieved those negative reviews shows that truly they are not to be trusted. That also applies to the youtube videos link in OP all two of them are the same video posted by different channels with bots praising the mixer, this is the main reason why newbies have being adviced countless number of time to stay away from crypto influencers that are constantly shilling different projects.
These are bidding, stolen and hacked Youtube channels that are misused to promote their fraud. The channels were adapted by the scammers in each case to gain the trust of.
Positive Trustpilot reviews can also be purchased online, the scammers pay attention to this. Nowadays it is not a particularly decisive point.victims so that they would send more crypto money to them.
I think you got it wrong, the phishing link is that scam site imitates the same reputable real site. What is happening here is scam not phishing.
The design of the site looks professional, but it says that they are CoinJoin technology, so it is better to use reliable services instead of an unknown site, since the mixing service is based mainly on trust.
Overall, thank you for reporting and I hope no one will fall victim to such scam.
In any case, you can call it a scam, but nevertheless the fake site appears to be real and authentic, which is also part of phishing.