Sensors app views issues

Accessing views throws "object not callable" error on Django v4 upgrade from v1.

E.g. accessing this v1/data endpoint on a development instance will through this error; raised when calling a bool as a function `is_authenticated()` . Of course, removing the brackets works as expected. What baffles me is that this works in the production instance running on Django v1. @thepsalmist would you know anything about this?