Yes, but since he frames it in the title as a "redesign," it's hard to get out of the frame of thinking about it as such. If he had titled it "A Simpler Notation for Piano Music" or something, his intent would've been clearer.
But then again, probably wouldn't have gotten to the front page without the word "redesign"
I understood the scope of the OP's suggestion. I just thought it could've been presented more clearly. The fact that tons of the comments here are directed at the idea of this notation as a replacement would seem to bear this out.
The title is "How I'd redesign piano sheet music," then the second paragraph (after the TL;DR) mentions guitar tabs.
At this point, we should just all agree that article titles are at least slightly sensational. If no one on HN debated the clickbaitiness of a headline, comment volume would drop dramatically.
But then again, probably wouldn't have gotten to the front page without the word "redesign"