Surprisingly (not), there's not a single news item on the new airline on the website of RTM airport, nor are there any slot requests if you look into the SACN (Stichting Airport Coordination Netherlands) website (which usually is very up-to-date). Thus either SACN "has forgotten" to list the slots for Europort Express, they don't start during S12 or they don't exist at all. My guess is on the latter.