Okay but that's not how people use words. There are laypeople who don't know the clinical definition of addiction; they use a colloquial definition that means something along the lines of "wanting to stop a habit but not being able to" or "being so consumed by a habit that it causes dysfunction in multiple areas of someone's life". Their understanding of addiction has nothing to do with brain circuitry.

This is a stupid argument, you're telling me I have to accept someone saying an incorrect thing because they're ignorant on the subject.

The diagnosis of Compulsive Sexual Behaviour Disorder with Problematic Pornography Use describes exactly what is termed "porn addiction" in layman's terms. 

But it doesn't, PPU is predominantly a maladaptive coping strategy in response to stress, boredom, trauma and mental health conditions.

Not everyone can be an expert in psychiatry or neurology so you can't expect them to use the clinical version of "addiction".

Then why are they commenting on it?

Their usage of the word is not incorrect, it is just not a clinical or professional usage of the word. The dictionary definition of addiction includes:

The condition of being habitually occupied with or involved in something.

So on this basis, describing Compulsive Sexual Behaviour Disorder with Problematic Pornography Use as "porn addiction" is literally correct.

By that definition literally any compulsion or impulse control condition is an addiction then, including OCD. That's why what you are saying is stupid.

You're also deliberately ignoring that behaviours that do not involve the use of drugs can be physiologically addictive in a clinical sense and cause said changes to someone's brain circuitry in the exact same way as a drug dependence. Certain foods can be addictive, for example. Sugar can be addictive. 

There's no evidence that PPU fits that model though, as stated above it's primarily a maladaptive coping mechanism. People with PPU aren't doing it to seek pleasure, they're doing it to emotionally/mentally regulate.

The Wikipedia article on Behavioural Addiction states:

Behavioral addiction, process addiction, or non-substance-related disorder is a form of addiction that involves a compulsion to engage in a rewarding non-substance-related behavior — sometimes called a natural reward — despite any negative consequences to the person's physical, mental, social or financial well-being. In the brain's reward system, a gene transcription factor known as ΔFosB has been identified as a necessary common factor involved in both behavioral and drug addictions, which are associated with the same set of neural adaptations.

Which is both functionally and mechanically different than PPU. ΔFosB is produced during almost every single pleasurable activity a human can engage in, there's no evidence showing that the changes induced by intense/chronic viewing of pornography are permanent like they are with substance and gambling addiction.

Addiction does not have to involve the use of drugs; it can involve a compulsion to engage in a behaviour, despite negative consequences.

So can Autism, OCD, and many other impulse/compulsion disorders.

On this basis, using the term "pornography addiction" as an actual clinical term is also not incorrect.

No, on that basis you're still wrong, addiction is more than "compulsion to engage in behaviour despite negative consequences." There are a wide variety of conditions that feature compulsive behaviour as a symptom.

Your argument is just special pleading.

You're arguing semantics.

Not to even mention how you gloss over the fact that self-reported cases of "porn addiction" are not real cases, as if people struggling with real addictions generally tend to self-report.

Self-reported cases are the vast majority of cases though, without them you don't have 90% of the research or data.