160g per square foot… really think about that for a second. How much physical space an ounce takes up, then look at what the plants are required to look like in order to achieve those numbers. They are required to have dense large flowers, otherwise this isn’t possible. In my mind, only a modern polyhybrid is going to have flowers that fit the criteria.
First thing, light penetration goes down several feet past the beginning of the canopy. This means serious wattage for lighting. You can’t have weak lighting and pull 160g/sq ft. Not going to happen. This kind of lighting set up is serious $$$.
Second thing, to achieve yields like that, you must know your chosen strains. You must know them well enough to achieve the maximum the strain can produce. This doesn’t happen by chance. Whoever achieved those numbers knew their plants very well to be able to get them to perform. Additionally, with the defoliation methods they use, you have to have stable females. Again, they know their genetics.
Edit the previous bost by BU2B illustrates a very good point… you can have incredible plants/flowers and still come short of those numbers posted by the OP. It’s like a fairytale situation that everyone will refer to as saying “I’ve seen it!!! It’s possible!!!” Is it possible? Yep. Is the average grower going to achieve anything like this in their lifetime? I think no…