The base fare is showing up at around 1800 on EF, so this is most likely either a fare that was there and was then pulled, or just a miscoding on the OTA site.
Results from https://www.ExpertFlyer.com
Code:
Fare Information Search:
Departing HKG on 23/12/19 for AMS
Flying SK
Viewing in currency USD
Searching in Business cabin
Show Fares for All Travel Dates
Fare Basis Airline Booking Trip Type Fare Cabin Effective Expiration Min/Max Advanced
Class Date Date Stay Purchase Req
J3HKBIZ SK J Round-Trip 1833.00 (USD) B 20/12/18 31/12/19 03 / --
03/04/20 13/04/20
01/07/20 20/08/20
...
Worth noting though that fares of around 1750USD (with taxes/fees) are available *from* various EU start points to HKG/PEK/PVG for the same restricted "first international flight" dates (lowest price from DUB as far as I have found so far - as it happens I made use of the same fare two years ago for a DUB-PEK/PEK-CDG trip)