Seems again you are having reading comprehension issues. But surely one study on 6 plants about the leaf contents, not flowers is a study worthy of fact.
from the study, which was with regards to leaves not flowers there is a couple of issues.
1. leaves not flowers.
2. only used 6 plants for an experiment, not exactly a huge test group.
3. "High nitrogen levels reduced the THC content of leaves, and older leaves contained less THC than younger ones. There was no significant interaction between these two factors."
4. Stated increased nitrogen produced more shoots, and more leaf output.
5. Speaking on thc levels in the leaves being betwen 0.3-.07% thc. One can easily argue this is an insignificant/negligible amount.
This study you posted has nothing concrete nor conclusive for your argument.
Feel free to keep starving your plants and thinking the leaves should be fried and yellow when you harvest. I will keep focusing on maintaining healthy roots and green foliage.
ETA here is a beautiful picture of my "hemp"
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