The Ninth Circuit made a critical holding: because Texas law did not apply to claims outside the signed contract, and because the claimed misclassification of employees as contractors is based on California labor code, the employer cannot get around the California statutes by agreeing with its employees on terms that violate those statutes. In other words, if the workers were deemed to be employees under California law, the fact that they signed an agreement that they will only bring claims against the employer in some other state outside of California, doesn't deprive them of the rights protected by California labor code, if they are employed on the territory of this state.
Thus, the class of misclassified drivers were allowed to proceed forward with their class action against the employer.