Someone else in this thread mentioned that going to about:config and typing telemetry will apparently show that some things are still set to true despite unchecking the settings in the Privacy section.

Note: I’m not the guy you originally replied to, and I haven’t personally tested this. Just pointing out where you can allegedly find those settings if you’re interested. (I personally don’t care and think this whole thing is overblown by the community, for what it’s worth)