Could it be maybe that Ryanair perhaps need to meet certain volumes to unlock growth incentives at other airports (ie BHX or MAN), and just holding off sales from EMA to force more bookings from elsewhere.
Nobody knows really what the reason is so can speculate all we like. Likewise nothing is on sale from LBA from end of March 22 when comparable routes from other UK airports are. I don't see it as a sign of closing EMA as a base personally.