ELI5 is not a literal request for an explanation a five year-old would understand; briefly consider how that would sound – useless, right? It’s a hyperbolic way of asking for a thorough, well-written explanation of a concept for someone who lacks the understanding to start asking the right questions or seek information on their own. There’s your ELI5 ELI5.
I might agree if the last single-sentence summary wasn’t there – that’s as ELI5 as it gets, I’d say.