So I got the NUS Infiltrator Jacket from the Twitch event, it was the last piece to complete the set.
It is claimed, account is linked, and it's showing in the game welcome screen as seen here

But when I go to V's apartment and open V's stash, it's not there.
I did not have problem with the previous 3 pieces of the NUS helmet, pants, boots.
I tried reloading the game several times already.
I'm in V's very first apartment in the mega-building.

Solution found.
https://www.reddit.com/r/cyberpunkgame/comments/177gwll/nus_infiltrator_jacket_cant_find_it_ingame/

Just for confirmation, are these the ingame names for those items?
- NUS Infiltrator Headgear
- NUS Infiltrator Jacket
- NUS Infiltrator Pants
- NUS Infiltrator Boots

Because I got all of those items, and I haven't been on Twitch in years, and I certainly don't have an account there.
Also, I don't have GoG Galaxy installed on my current PC.

HOW? Was it Cyber Engine Tweaks? I'm really tired of "watching" these Twitch channels participating in custom drop nonsense

Yes, it was. Just like I expected would be readily available once the codes - and CET itself - had been updated for the 2.0 patch.
I got the "exclusive" rewards for Twitch, Amazon, GWENT, GoG Galaxy and everything else that way.

You got CET installed? Anything in particular you want the codes for?