No, there are non-US companies that sell consulting services to US companies. If you are employed by one of these companies, you work as a consultant for a US company (usually as part of a team with several compatriots), and you are not a freelancer since you are employed by your company. If the contract finishes and you're left without a project, you're still employed and drawing a paycheck, and it's your company that finds you a new project to work on.