I’m happy to see I’m not the only one that Google searches like this after a certain level of frustration. “How the fuck do I do the thing and why did they change it in the first place? This is fucking stupid, Google, why can’t you just answer my fucking question, you dumb shit?”
Gameplay design is the design of how the game plays. Level design of the design of the levels. In this scenario, the problem is not being able to advance until the platforms are even, which is an issue of gameplay design.
To be fair, being a mesh design, I would want to pick it up by the pyramid, too.