What makes you say the ratings are arbitrary? Can you point to any of the papers in which the rating is out of sync with the conclusion of the linked paper?
Some smart French guy debunked this site https://threadreaderapp.com/thread/1284493669895041024.html And c19trials, another disinformation piece from the same authors.. https://threadreaderapp.com/thread/1291126570392924160.html
I think given that Doctors such as Simone Gold are being fired simply for stating that there's scientific evidence that HCQ can treat Covid-19 it's somewhat expected that sites such as this will be done anonymously.
Only a fool or someone just looking for confirmation would take an anonymous sham of meta-analysis seriously.