Not quite - "heerlijk" used to mean "lordly", so "heerlijk voedsel" means "food eaten by lords". This also explains the gravestone reference (de Heer == the Lord).
Thanks for clarification! Good to know. I often find it hard to learn and retain the multiple meanings / history of words in a second language. I do know de Heer, and Herengracht etc. I just hadn’t put that together that it’s same origin.