Did you miss that part?
I saw it, I just don't buy it. They got some engineered strains that produce higher THC concentrations, but they're so fragile they can only be grown hydroponically, and only constitutues a tiny percentage of the cannibis production. They're implying that this "superweed" is now the norm.
Beyond that, the comparison of cannabis to heroin or cocaine is flawed. If you processed the cannabis, extracting out just the active ingredients the way cocaine or heroin are produced the end result would be pure THC, and would be the same regardless of the cannabis plant you started with. It's a game of half-truths and tacit lies and you seem to want to help them with it.
Because the majority of THC-containing molecules in a pot plant are contained in trichomes on the plant's exterior, care taken during harvesting, manicuring and storage/transportation is what determines THC level in any sample of pot, much more so than variety.