Check the ID numbers (48410844 < 48424862) and bear in mind that Hacker News has this thing where sometimes submissions get re-cycled for attention. Yes, annoyingly it does seem to make the presented datestamps wrong.
People submit a lot of stuff all the time, very few people go through "New" and thus a new submission probably have a very short life time before it is drowned by newer submissions.
A submission to survive most likely needs some initial push from non-organic voting.
It probably helps if you share you submission early with your colleagues and in other sites.
I've had this experience a few times so I don't post submissions anymore either (including one of my own articles being flagged despite over a hundred comments). I know people will say vote rigging doesn't happen on HN, but I think it's naïve to think any site on the internet is impervious to vote rigging.
I think it's worth mentioning Gustavo Pezzi's lectures at pikuma.com. The one on "Digital Electronics" and the one on "Interpreters & Compilers" really helped me.
https://news.ycombinator.com/item?id=48424862
I'll just stop posting on HN.
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