Sounds to me like it's some "random commentor" who has solved a similar problem at a similar scale with a solution that's much simpler.

I think you're reading into it. They are stating that the solution in the post was overengineered, and describing an alternate solution that doesn't require as much abstraction or resources, but is manageable for data with a much higher dimensional structure

The fact that you read that as "I am very smart" and that that was a reason to downvote the post, tells more about you than it does the person you're supposedly describing.