How do you figure? Grilling is placing meat directly above the source of heat. This is fine for certain meals, but it is definitely not barbecue!
Barbecue can be either pork, beef, poultry, venison, mutton, or curry. I have no idea where barbecue can only be pork came from since barbecuing actually refers to how the meat is cooked (slow and by an indirect heat source of wood and/or charcoal). Saying that barbecue can only be pork makes no sense to me.
Those meals you described about grilling sure made me hungry.
Where's my wife? Papadeaux's is in order tonight!
By your line of reasoning, it could also be bear, fish, elk, etc...
I don't know how I would BBQ curry...although I could sure grill a curried pice of meat. In fact, I think in some places "curry" might mean lamb seasoned a certain way.
As I have said in some previous posts, it is a dialect thing. When you say BBQ here(SC, USA) you are talking about a hog slow-cooked over hickory with a sweet mustard sauce. Tell someone to get you some BBQ for lunch and that is what they will bring. When someone says that they want BBQ, that is what they are talking about.
Now, your assertion regarding the slow-cooked, indirect grilling sounds like it might not be from webster's dictionary, either. And you aren't from Australia, either.
My ever-evolving assertion is this: the position that I have maintained on this and other threads regarding BBQ will eventually win a worldwide culture war. If you ever taste it done properly you will understand why BBQ will mean this substance, and all others will be qualified(BBQ chicken, BBQ beef, red BBQ sauce, etc...)
Especially when eaten in the context of the traditional July 4th or Memorial Day 2-day party(drinking binge) nothing by the same name can compare.
I have lived on the west coast, and I have lived in the midwest. I love Tex-mex, I love all kinds of good food. BBQ ia not my favorite food in the world! But the honor of the name belongs to the best, and if you'll have it you'll know:
Barbeque is a hog, slow-cooked over hickory coals with a sweet mustard sauce.