Im calling bullshit. Could be wrong though. Who knows
That isn't bs, but it also isn't logistically easy to do.
If you search around for some huge pot count sogs you will see getting up to those numbers become less shocking. Firstly that many plants lets you fill in the entire canopy with a main cola, it's really a big deal. Hps also has better light penetration than leds (unless that isn't so any more?). This kinda means that at a point HPS can out perform in weight, however I'd argue led gives better top bud quality due to a lot more of the top canopy being in good par range. It's kind of a trade off.
What would be highly impressive is pulling 2gpw in a 4x4 tent with only 4 plants and led. It's very likely doable but I'm not so sure a flat canopy is the way to go about it. This is ofc assuming a strain that isn't a pure cash crop, those tend to yield very high but are shit smoke.
The only real issue is what people define as quality bud. For example I am around the 1.3 mark of top stuff. I ''could'' mix in some upper mid level stuff and nobody would ever know once dried, bar a lab test. That would easily push me into the 2gpw range. To me I don't know if it's as good as the top stuff so I just don't mess around like that.