For what it's worth, I just got notice that my flight SEA/DUB on 9 Apr is canceled. Even though the timetable portion of the web site still shows EI 052/053 on the books, I don't see any availability through May 2022.

Other US west coast cities, like SFO and LAX, still appear available to be booked. Correction: LAX has also been zero'd out like SEA, at least for the dates I checked in April. SFO is still showing for sale (but with a fraction of the number of seats sold, based on the seat map, of SEA or LAX for the same day).