No, agnivade's post was earlier, as you can see from its ID as well as from https://news.ycombinator.com/from?site=mozillagfx.wordpress..... We put it in the second-chance queue, described at https://news.ycombinator.com/item?id=11662380 and links back from there.
When we see a good article that fell through the cracks and put it in the second-chance queue, we try to pick the first submission of the article.
When we do this, the submission timestamp on the front page becomes the time it was put in the queue, approximately. That's why it looked like a later post than yours. I don't like doing this, but not doing it invariably triggers a barrage of questions and complaints ("what is this 2-day old story with 3 upvotes doing on the front page"). You can always see the original timestamp by looking at the submission in the user history (https://news.ycombinator.com/submitted?id=agnivade) or the site history (https://news.ycombinator.com/from?site=mozillagfx.wordpress....).
More here if anyone cares: https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme...