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This gets my vote for the most ridiculous headline on HN. Complete word salad with very little meaning

Even if you're "in to" bikes, it's almost unintelligible aside from knowing Shimano is a brand.

I back this sentiment.

You only have to know that Di2 is Shimano's electronic shifting to be able to guess what this is about.

Compare with, currently on the front page:

"Comparing Ceph, Linstor, Mayastor and Vitastor Storage Performance in Kubernetes"

If you're into (road) bikes, you probably know Shimano, Hammerhead, and you definitely would know what Di2 is.