Display MoreNCT wasn't mentioned simply because a small number of surveyed people answered that they know them here in the States.
In terms of popularity for K-pop here:
----- big wall-------
2. BP
----wall----
3. TWICE
-------huge wall------
The rest of K-pop.
NCT has decent physical sales but do not have good streams. BP, TWICE, BTS, SKZ, and even TXT have all hit 100 million on-demand (platforms like YT, Spotify, Apple Music) streams in the US this year.
Actually, based on this survey the only thing that can de deducted is BTS>>>>>>kpop
The sample size is so small that all the other differences fall within the margin of error (if the errorbars overlap, it means difference between the %'s isnt statistically significant):pasted-from-clipboard.png