Oh I mean, sure, but I don't think IP logging is the main privacy concern with spy pixels.

I'm assuming this trick uses the user agent string and other request metadata to identify clients. Even if it didn't recognize Jerboa as a client, it did guess that I was on mobile. That's not possible just by tracking IPs, unless they're cross-referencing it with other datasets. Also, I was on VPN anyway, so the IP would have been useless.

It should be possible for clients to obfuscate/fake the metadata of image requests to make tracking with spy pixels less effective.