The video, I think they used pretty accurate setup to do the 'cloud based a/b test'.
I don't know how exactly they do the recording. But I have seen other people using this setup:
https://3diosound.com/
And some people using the IEM frequency response curve measurement setup.
And 1 year ago I have been to the store actually, they have a good line up of TOTLs from almost every brand (and I tried them all )
I am using LG V30 and a good 8+2 IEM (8 BAs & 2 DDs) to watch this video, I like u18s the best. The u18t's sound is the same as I remembered (I just sold mine 1 week ago), it is very clean and detailed, but a little bit on the lean and analytical side, while A18s sounded not only more realistic and more polite, it is also sounded like a totally different phone from u18t. Now I understand why the reviews in the say 64 Audio should give it a different name.
Tia: is more 'bloated'.
I like A18s > u18t >> Tia.
Would love to know the name of 8+2 IEM (8 BAs & 2 DDs)