I gave the author additional exposure for his work. I've been on HN for years and this is the first time I've seen something like this.
Knowing nothing about the situation, it looks like
1. You work for ProductHunt.
2. This is a veiled promotion of "your" site.
3. In any case, the comment adds nothing to the conversation for HN readers. It's merely a personal message to the OP.
As someone who has also been on Hacker News for years, that's my take.
Edit: You'll notice that other, similar "low-value" top-level comments have also been downvoted: "Love it! Thanks!" and "good job".
Although such comments are polite to OP, they add nothing but noise for all the other readers of the thread.
I gave the author additional exposure for his work. I've been on HN for years and this is the first time I've seen something like this.