I have never bought into those porn studies causing ED. Seems to me, there was a hidden agenda being pushed. Men have been looking at porn, in one form or another, or a long time. Granted, it is much more accessible now with the internet, but it's not something new. So many articles and "studies" these days seem to be geared towards shaming men in one form or another. Example: "Toxic Masculinity" and "Boys will be Boys is oppressive to women".
Masturbation and porn, like anything, can be done to excess, but I seriously doubt it causes ED in the majority of men.