IIUC, the basis for this claim is that Kagi pays Yandex (a Russian search company) for access to Yandex's image search API. Is that the entirety of their link to Russia? If so, it seems like a stretch to accuse them of being a "Russian disinfo laundering service" (GP's words, not yours), but this is my first time hearing this, so if I'm missing something, I'm all ears.