Is Cover Your Tracks/Panopticlick a good way to test browser security or is the EFF full of shit?

[GHTD]

I know daddy Null likes the EFF but I'm curious if Cover Your Tracks (formerly Panopticlick) is actually a good tool to test your browser privacy settings.

Cover Your Tracks

See how trackers view your browser

coveryourtracks.eff.org

 

[The Mass Shooter Ron Soye]

I thought it was outdated, maybe not though.

https://www.eff.org/deeplinks/2020/11/introducing-cover-your-tracks