I don’t get the impression from that article that Daniel and Scott are curating the front page in the way the thanks in this thread suggest. I am still of the impression that the front page composition is decided by upvotes, downvotes, and flags. Contrary to the implication in this repos’ text.

Scott hasn't been a mod for years.

What is that impression based on?

The article, the HN's guidelines and FAQ, Dang's accumulated comments, etc.

Besides upvotes, downvotes, and flags, there are software penalties like the flamewar detector and various anti-abuse measures, and moderation downweights. We do a lot of the latter—I don't want to underemphasize this. The overall system is a combination of these three subsystems.

You're right that user flags do more than mods do, just because the numbers work that way: there are many orders of magnitude more users flagging things than there are mods.

Edit: 5 orders of magnitude more, in fact!