No matter what training you receive, it’s up to you as the individual to apply the concepts.
GoLeanSixSigma.com’s training material is geared toward practical application, but without the motivation to apply and learn in real life, there’s no guarantee that any training makes someone a practitioner at something. Effective learning usually includes both.
Also, Green Belt level training increasingly shows up on job postings as problem-solving grows as a desired skill set.