You have mix up in static and non-static usage. Your style is non-static, but your methods are declared as such. If you enable WP_DEBUG mode you’ll see following errors:
Notice: Undefined variable: this
Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object
This happens because static method doesn’t “know” what $this refers to, since static isn’t tied to specific instance of the class.
Simply declare your methods as public rather than public static for this code organization.
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