It's clearly still being promoted on the SK II Japan website...

It's clearly still being promoted on the SK II Japan website

https://www.sk-ii.jp/ja/whats-new/skin-solutions/slow-down-aging-in-drier-months.aspx

Maybe the Japan retailer was simply sold out.

I note that at this popular Singapore online outlet, it says 'Back in Stock'.

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Item code : 426813192 COPY URL
SK-II[BACK IN STOCK!]New! SK-II RNA Power Booster - Anti-aging moisturiser. Formulated with Pitera Radical New Age
Scroll down to the question and answer section, and there's a question on Nov 15 asking if the booster is  still available. And the reply is 'we are restocking at the moment'. And now it's 'Back in Stock".
So still around in Singapore.

http://www.beautyoutlet.com.sg/item...R-ANTI-AGING-MOISTURISER-FORMULATED/426813192

Also notice this English language video review from last week



And several recent reviews in Indonesian media

http://www.cosmopolitan.co.id/article/read/11/2017/13094/