Firefox on iOS still doesn’t support extensions and yes, is still based on the same engine as the other browsers.

YT ads are not blocked on Firefox on iOS, I just tried.

I didn't pay much attention about the warning in the article, you're right. 😅 I'll edit the post since I've been too concise, and I have a lot of negative downvotes. I am quite confident that my YT account has already been "rolled out" because of the many ads in the last 5–7 days. Before, I had 1 or 2 before some videos; now there are also pop-ups. I have made some experiments with VPNs (Mullvad) and browsers in several fresh VMs. uBOL works differently than the standard uBO and, from what I've seen, it seems to work fine. I'll just stop repeating that.

New macOS Sonoma VM, brand new Firefox installation with just uBOL (not uBO). YouTube does not show any ads. ISP dns and no pi-hole or others.