"yourbrainonporn.com" is about as reliable as quoting D.A.R.E. for information on drugs. In other words, it holds literally no weight and is likely religion-driven "family values" propaganda.
Just to correct myself, the page I linked to is actually about making the case for the link between dopamine and addiction. The effect of porn on the brain is made indirectly.
A lot of other things are also highly addictive though, like social media. So where do you draw the line? Also, why are some people so much more addicted than others?
The site is founded by an atheist, and looks to science for making an informed view: https://www.yourbrainonporn.com/about/about-this-site/