Sorry buddy, you don't just get to make up definitions of terms to fit your mood. I'm using it correctly, so are the authors and signers of the pledge in question, and you are now making stuff up, by your definition something can only be a pledge if the action or lack there of is something you don't want to do, and I say again, any pledge stands or falls on its own merits.

1. a solemn promise or agreement to do or refrain from doing something: a pledge of aid; a pledge not to wage war.
2. something delivered as security for the payment of a debt or fulfillment of a promise, and subject to forfeiture on failure to pay or fulfill the promise.
3. the state of being given or held as security: to put a thing in pledge.
4. Law . a. the act of delivering goods, property, etc., to another for security.
b. the resulting legal relationship.
a. the act of delivering goods, property, etc., to another for security.
b. the resulting legal relationship.
5. something given or regarded as a security.

verb (used with object)
9. to bind by or as if by a pledge: to pledge hearers to secrecy.
10. to promise solemnly: to pledge one's support.
11. to give or deposit as a pledge; pawn.
12. to stake, as one's honor.
13. to secure by a pledge; give a pledge for.