
5 days
An engine is the collection of core runtime features on top of which gameplay features and assets are put on.
A 4K texture pack and a few particle effects aren’t an engine update, it used to be available through mods.
What an engine update would be for example is seamless interior cell loading, or seamless high density cell loading for example.
Or better texture streaming, so on. A better engine would mean same exact screenshots, but more FPS and less loading screens.

It wasn’t pulled from Wikipedia, I am an engineering manager and thus I spend a lot of time defining technical stuff for non tech people of varying aptitudes.
But I guess you’re right, NY train of thought was that people tend to equate game engine with look and feel, while most of it is not that.