The contract language is pretty clear. The company owns all IP invented by the employees in any time during employment. In the absence of state or Federal labor laws making exception, the agreement is cut and dry. It is an enforceable contract, signed by the employees.

You might say it's not fair. Yes, it's entirely written for the employers. That's why there's needs for state or Federal labor laws to help the little guys.

I don't know why you want to get around it and trying to give false hope to people. If you want to claim the contract is not enforceable, then you should provide citations for the claim.