Can't consider ddosing NH or NH cheating.
"NH" all what you listed isn't really cheating..
Using overheads is a part of the game, I wouldn't consider using prayer cheating when you use it while bridding, it's now popular to use while bridding as a Pure, I wont really consider it NH.
Also when bridding a main/zerker a pure doesn't really stand a chance when not using overheads, it adds more skill to the fight, it's a pures defence.
In my eyes being NH means being lame towards your enemy, for example praying on specs in edgeville, pjing / rushing+tubbing etc.
90% of the pures / Pkers @ west drags do carry tabs, I wont say no to my tabs, why shouldn't I tab when everyone else does? and when most times you actually get a kill you get pjed, should I just sit there and let them kill me? Being "honour" (your definition of it) would just be stupid, of course back in the day people didn't use to pj that often, didn't use tabs that often, but times changed.
I always PK with tabs (if not in edge, never had to use one), I almost always use overheads while bridding.
There's 2 types of Pures that are NH, those who just use tabs because everyone does, who use them when they get pjed, they use overheads because it's part of pure pking involving more skill, and those who pray on specs in edge / tab after specs / pj / rush / tab when close to death etc.
Honour or NH is more of a question of respect (even though it's a game) if you ask me.
I don't know why you even connected this with ddosing.
Fat 30 year old nerds and chields ddos because they probably feel strong and special when they do, they probably feel gangster, though every idiot that is willing to pay a few bucks and doesn't have the brain of a 6 year old is able to ddos, sad people actually pay money for **** like that, RuneScape is a game afterall..