You misunderstand. They're calculating a fingerprint that identifies you across sessions despite you changing up a bunch of values on your browser with an extension because that's all highly detectable. They know it's junk data they don't use it. It actually is worse because you stop blending in with the crowd.

You're better off blending in then trying to look unique with every visit. The latter is a flawed concept.

Read the arkenfox guide they get into it. Most extensions just reduce your ability to blend in to the crowd and thus should be avoided.