No. Let me simpify.
A union enters into a contract with a group of people, delineated in this case by pilots at US.
IANAL A valid contract includes that two or more parties, in this case, USAPA and the pilots at US, must contribute goods or services, generally the union contributes services, the pilots contribute dues. The union provides representation, in most of its forms, in return (the quid) for dues. Under the previous union, the contract resembled more of a franchise, the union providing, sometimes, conflicting goods and services to different groups, in return for dues. The present union will not be hobbled by conflicts from other pilot groups, and, hopefully, will tailor a product specific to the US pilots. Your views to influence the "tailoring" can only happen if you pay full dues.
Your representation will depend on paying dues as well as what you put into the service. You can pay dues yet not receive representation if you plan on being a couch potato. A maintenance fee gets you representation at the bargaining table as well as the CP desk. The couple extra dollars for full dues status gets you representation at meetings through speaking and voting. Your future is in your hands.
Hope that helps.