I just checked your tracking code. It looks like you're using the locale storage to set a session id to track uniqueness. According to this [0] Stackexchange answer you will still have to display a cookie banner.

[0] https://softwareengineering.stackexchange.com/questions/2905...

The local storage is mainly for performance. It's to prevent a round-trip to the database to figure out the session again. The session id will be the same regardless and it can function without local storage. But I do see your point. I may consider removing it just to be safe.