You are absolutely right. I’m certainly not claiming Yandex passes these tests either. They’re clearly guilty of censoring content critical of Russia. So far only Kagi has passed all my tests.
Good question. I just tested them. The results share about a 70% overlap with Google, with similar ranks, so I'm assuming they basically just use Google's results with a filter and privacy layer. There's no sign of the actual website, so Brave fails the same way Google does on this test.