It doesn't seem as if he's passing judgment on THC or it's users - just noting society's changing views on the topic.
That's great for your friend's daughter. I have a friend who's been battling glioblastoma for 6 years and he claims that his CBD/THC use has saved his life. When I was a kid undergoing rounds of chemo at Roswell, they'd often give me marinol as an antiemetic (made me high as F, but at least I could eat), so it's not as if the medical establishment hasn't known of the virtues of THC/CBD use for decades.