I just got an email back from aer lingus going to copy and paste it here

looks like they will still pre clear.
Thank you for contacting Aer Lingus USA Pre-Flight Care.
Although we do not have the fall schedule for PreClearance in Dublin at this point, Aer Lingus flight EI121 from DUB-MCO departs before 4:00pm and thus should preclear US Immigration and Customs in Ireland.
We trust we’ve answered your question to your satisfaction. Should you require any further assistance, please contact the nearest Aer Lingus office by phone at one of the numbers below, and any agent will be able to assist you.
Kind Regards,
Deirdre
Pre Flight Customer Service - USA
www.aerlingus.com
Within North America: 800-IRISH-AIR(474-7424) +1-516-622-4222
Ireland: +353 0818 365000
UK/N. Ireland: +44 (0) 871 718 5000
Visit
http://www.aerlingus.com/help/contactus/ for a complete list of opening hours and contacts by country.