If you read the information on the first page of the Trinity website you will find this:

Some states require a license to be involved in specific areas of the natural health field. Trinity College of Natural Health is not designed to provide a vocational curriculum to meet the requirement of any particular state where a license is required. Programs of study are for personal enrichment, self-improvement and focus on a pure, unadulterated, natural lifestyle. Trinity College of Natural Health does not maintain a \"job placement bureau\" and as such no employment is offered to those enrolled in its educational programs.

That\'s how they can operate legally.