TL;DR: Mozilla has a new CEO and a new mission: transform Firefox into an AI browser. That has run into some snags, as Firefox users don’t seem that interested in AI. Mozilla is forging ahead, utilizing deceptive patterns (previously known as dark patterns) to nag and annoy people into enabling AI features. You can see this in the introduction of Link Previews, an extremely invasive anti-feature that exists solely to push AI into your experience.
It’s just supposed to save you time and effort.
If anyone has real concerns about having their IP leaked they should be using a VPN (I think Proton has a fairly generous free tier) or TOR. Relying on a link preview feature like that would be like wearing a condom against the rain. It will technically increase your protection, but you will still be really quite exposed.
No, I just took his objection at face value.