Yes, it is covered technically. But practically nobody knows what is infringing in the non-literal infringement case. It all depends on the judge and context. Was this idea sufficiently original or was it a necessity, or a generic pattern? Each level of abstraction can get protection from copyright. You can only know if you sue/get sued.

I find non-literal copyrights (total concept and feel, abstraction filtration comparison/AFC) to be a perverse way to interpret "protected expression" as "protected abstraction". It is a betrayal of future creative activities to prop up the past ones.