I heard this one about 20 years ago. Was no "internet", but plenty of books on growing. I read most of them at the time and "birth control pills" were not something that demanded many pages of elaboration. To my recollection, most reference were nothing more than a "it has been reported/there is a rumor/we once heard" sort of thing. You could try it. The only way to really determine if it works is if you apply it to clones in a very strict environment. Seeds (even from the same bud) can have drastically different growth habits anyway. Just my thoughts.