I did have some LA's: Suncrest, Madrid, Brindisi, Royal Sunset and a few others I can't recall at the moment. They were pretty decimated so you may be on the right track with your theory. It certainly did seem that some were more "tasty" to the beetle than others. I still have a small clump of Royal Sunset, missed digging a few bulbs I suppose. On the Prairies where I live the lily was "the" plant along with the Peony so it has been devastating for gardeners here. We never thought that asiatic beetle would survive our brutal winters; boy were we wrong!
I looked up your Laukon Lily- it's a beautiful one! I can definitely understand getting suckered back in, especially now that some are saying the beetle is declining-?maybe cyclical? It was very difficult digging out those lilies that's for sure.