This topic comes up now and again. It's nonsense. Stoner science at it's finest. There's some guy with some crappy looking fried up plants that has a couple videos on youtube where he cuts the top off of all the flowers on his plants. Reminds me when people would say to yank the plant and boil the roots to force the resin to the buds.
To get the best flowers give your plant what it wants. Good environment, plenty of light, and proper feeding. That's how you get the most robust flowers.
Here's one. Go to minute 3:40 and look at his crappy plants. He obviously doesn't know what he's doing that's why he's chopping the tops off his buds. Where did you get the idea to do this anyway?