Nope laowai is just a term referring to foreigners. By78 is just joking how even foreigners are interested in Chinese firearms. If you look at the previous pics, the photos only consist of Chinese media personal.Is only white people considered laowai? I'm pretty sure that there have been lots of pictures of Arab/Africans on the expo.
You can't use HMG like GPMG for the simple reason of ammo volume.China uses HMG almost like a heavy GPMG if I'm not mistaken.
This video talks about a titanium HMG that weights 9kh less than type 89.