I am guessing Rick is seeing the tip of the abdomen open up and move up and down and calling it releasing pheromone.That's what I think also, when I see my adult females do that.
Other insects do that too. It's kind of amusing to see how the male reacts to it sometimes.
I kept some silk worm moths before, and they have blatant organs that they expose when releasing pheromones.
And you can see how much time it takes for that pheromone to reach the male even if it's invisible.
The male would just be very calm before, and when it reaches it gets extremely jittery and excited and starts fluttering right to the source. Almost looks like he's spazzing out.
Sometimes I have to put the male mantis' enclosures waaaay away from the female's because the pheromone reaches it, and the males start going crazy(even if they are in separate containers).