Some of the gene editing stuff is really fascinating and scary at the same time. IMO Yield is useless unless you are selling it for profit. I am not growing the plant for yield, I am growing the plant for oil production and the various cannabinoids found inside the trichomes. So I am not worried about High-Yield, I concentrate on higher cannabinoid or trichome production.
A hormonal product like "Winter Frost" which triggers the plant that it is about to die and needs to senesce and push that last little bit of oil production is a better avenue than gene editing. "Black Light" as they mentioned is likely them explaining the various UV lights that trigger a response within the plants to produce more trichome "sun-screen" to protect the plant. Thing about UV though is it causes the plant to divert energy from bio-mass creation and put it into oil production, meaning the use of UV light will actually decrease your yield, but give a higher THC/CBD content over-all. Light itself is the energy to drive photosynthesis, so increasing the light at the end of flower can increase your yield as much as anything. Under-canopy or Intra-canopy lighting will develop the lower flowers and give a much higher quality over-all. CO2 is probably the cheapest input with a direct influence, but CO2 requires a sealed area or you are just wasting it.