I posted this in the "Deals" thread, but just got email confirmation that this is a 48-hour D1 award flash sale (the first since Covid hit) --
https://www.flyertalk.com/forum/33792168-post5424.html
The email appears to have errors as availability for these 148K roundtrip US-EU D1 awards looks to be for 12/14/2021 - 4/7/2022 on all routes.