I think they must have nuked that claim, because the current blog post doesn't say it, only speaking to their use of "open-source language models"

Definitely underhanded of them to just update it in-place, without an edit note

It seems the Wayback machine didn't get to it in time, as the snapshot also doesn't cite it

https://lumo.proton.me/about still has the claim

> With tech that you can see — and trust

> Unlike other AI assistants, my code is fully open source, so anyone can verify that it’s private and secure — and that we never use your data to train the model.