GAZMO,
Bergamo starts again 21 December, back to twice weekly in January 2020. Perhaps cutting out the very low demand period, until the ski season gets going.
I wonder is NI really that seasonal, that FR could have a good programme during the summer, like Jet2, but cut back to the bones during the winter. Will be interesting to see if these cuts to winter 19/20 carry on into Summer 20. The Polish route cuts are interesting however, as you would expect with VFR traffic, demand would be fairly steady year round.