Title says "helps" but the summary says "it doesn’t effectively treat anxiety, depression, or PTSD". Big difference between the two IMO. Plenty of people use cannabis to alleviate symptoms. I don't think they expect to be cured entirely. Getting a good night's sleep or being without chronic pain for a few hours is often enough.
Exactly.
People looking for long term solutions to those issues need to address the root cause(s), which often requires therapy, lifestyle alterations, and work on the self. Change doesn't happen overnight, and it might even take a few tries to find the right therapist.