He's right.
I did heavy deflorations, lollipopping, super cropping and lst during flower & late flower on autos and they didn't herm not even a seed.
But the heavy defloration probably took potential of the plant. I do not recommend any of those techniques if the plant is not healthy or for newbies(like me) if they can't detect males or take the risk to get them. It's all about trying different growing styles and techniques imo. I want to do all at least once wheater people say it's bro science, not effective, recommended or whatever. Just have fun