Yep, the Leopard 2’s were destroyed in significant numbers. Yes, they lost a number of helicopters, not all same type.
The only confirmed Turkish military helicopter combat loss in Syria that I could find was a lone T-129 ATAK that went after a Kurdish settlement with a wingman and was evidently shot down by tracerless AAA.
They’ve had the usual range of non-combat equipment failure and hard landings expected of helicopters worked hard in combat zones or in support roles.
The Leopard 2s, though... the Turks *still* don’t have an APS for those (to be fair, we only last year hastily started ordering Trophy APS for the Abrams after seeing what Konkurs missiles did to Turkey’s near peer frontline NATO tank with composite armor) so even if they start operating them properly (with proper infantry support) they’re still going to lose lots of them.