This is subjective and can't be proven true of false. Art therapy is a proven form of therapy, according to the Lukin Center for Psychotherapy and the National Library of Medicine. According to the National Library of Medicine, art therapy is "a non-pharmacological medical complementary and alternative therapy, [which] has been used as one of medical interventions with good clinical effects on mental disorders." The article clarifies that art therapy has been used to reduce suffering of patients with mental disorders such as depression disorders and anxiety, cognitive impairment and dementias, Alzheimer’s disease, schizophrenia, and autism.
The claim above that art therapy being better than traditional therapy cannot be generalized to the entire population, as everyone has different therapeutic needs and everyone's brains work differently. Someone who experienced severe trauma may find art therapy more effective than traditional therapy but someone who benefits from verbal communication may not find it effective. The article cited to make that claim is from Creative Arts Therapy, an art therapy organization. While this could lead to some bias, as the company specializes in art therapy, the article linked above which leads to their blog actually compares the benefits of both traditional therapy and art therapy and explains who might benefit from art therapy and who from traditional therapy. No where in the article does it state that art therapy is more effective than traditional therapy.
https://www.davenportcreativeartstherapy.com/blog/art-therapy-vs-traditional-therapy
https://www.lukincenter.com/unmasking-the-truth-demystifying-clinical-art-therapy-and-its-benefits/
https://pmc.ncbi.nlm.nih.gov/articles/PMC8397377/