Newbie here
It is better not to ejaculate - considering that you are also working with psychological factors here. As I see it - PE is also useful for building sexual self worth and self image, as well as patience. PE exercises are the same as weight training - wear your t-shirt when it matters, not in the gym. Ejaculating every time you do PE’s is more of an ego-response. Put that libido energy into the exercise - and do not make the ultimate goal of the session ejaculation.
As gainer guy said - edge - do not ejaculate. It defies the object. I have had very good gains from sticking to the newbie routine for 3 months - and have now moved on. As a matter of fact - I prescribe PE to clients who have developed chronic masturbation problems - and it helps them control the impulse and push the energy into a different direction - gaining inches.
I am not implying that one should stop masturbating - but it does stop the process of cellular regeneration, and that has a scientific basis. It is the endocrine system that initiates a release of hormones (based on emotional response) which then interacts with proteins to produce the process of cellular regeneration (growth). If you stop the emotional response (I.e: take away the feeling of anticipation/achievement) the endocrine system stops the process - not necessary anymore - I.e;, out of mind, out of action.
So the growth process stops.
Just my cents worth