I actually assumed it was an in-house job by TVThai.
What I find with foreign stations using American news themes is that they tend to use very few cuts out of the whole package (sometimes even just one). ThaiPBS/TVThai using a wide selection of cuts from Extreme and Signature seems to be the exception rather than the rule.
Doesn't seem to make sense to pay for the whole package just to use one cut; I dunno if they are somehow licensed under different terms.
Case in point, that news magazine on China's state TV network which uses a cut from B Package as the pre-show bumper, Advantage as the show open, and Newschannel as the close. I really don't see CCTV paying for 3 packages only to use one cut from each, so I'm guessing those cuts were licensed from Gari as some form of production music.
As for the NBT anchors... the male anchor started talking pretty much after you stopped watching. I really don't know what the deal is with them. I'll guess they're just long-winded and verbose in their newswriting, judging from the absurdly long pre-show bumper (which also seems to be a recurring theme among the other Thai channels)...