Aint buying it. It's the leaves' food production that produces it all including THC and if you induce leaf necrosis, premature leaf drop, with bloom foods.....you're a dummy. For most newbs they've allowed themselves to be brainwashed by the dozens and dozens of cannabis specific bloom food pushers and forum sucker bets thinking that it's bloom foods that produce "da hard buds". I and other experienced growers who have chosen foods with decent amounts of N know that's bullshit.
Wean yourself from the label teats.
If you don't have a good and healthy root and foliage mass going into the flowering response AND harvest, you will have missed the full potential of your plant material.
UB