It's a new listing with reviews starting late December 2019. The SKU on the listing "YD1600BBAFBOX" matches the techspot review
and people are confirming it's the 12nm version in reviews
Noah
5.0 out of 5 stars Great chip
December 21, 2019
Verified Purchase
Can confirm I received a 12nm version as well. Runs like a champ so far. What a deal.
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PeaJayTheGr8
5.0 out of 5 stars Wow! A Ryzen 5 1600 Zen+?!
January 3, 2020
Verified Purchase
This is def a Zen+ refresh at 12nm. I did a review on it on YouTube sharing my experience under the same username here. One thing to note is that Ryzen Master software doesn't seem to work with it as it says it is an unsupported chip, but it is legit and works just a hair under the Ryzen 5 2600 performance. The price and performance is amazing! So amazing, I bought a second one!