Well if it does turn out to be birds, that'll be two 737-800's and one A320 in the space of the last four(?) months.
Looking at the photo of the engine the top third (of the fan) seems to be almost undamaged. No or very low rotation at impact? Of course if the aircraft impacted belly first with very little forward motion that could well explain the damage to the lower part of the fan only - instant seizure at impact.
Another bad day
A4
PS EHAM has had a NOTAM for birds for months.