Ah sorry, I don't know much about this topic, I just mess around and bash things together till it works.
The texture is a 2048x2048 (12 LODs) in DXT1 format, according to this tool I am using (SpecialK) :
Here is the actual file that gets dumped, 2.66MB: https://files.catbox.moe/kztoqq.dds
So I guess the next question is how i'd go about uncompressing the 2.66MB back into 15.996MiB size.