The conditions state 'last seat availability', i.e. you get a seat as long as there is anything in Y available. I don't think the booking confirmation shows the fare class, feel free to check KL 1799 on Jan 19 and KL 1800 on Jan 21. I looks like though that I will get more miles than I got usually in the past on my ~100-120€ bookings... "You will earn:1642 Award Miles 938 Level Miles"
By the way, forgot to mention, got a really nice e-mail recently: