Many on HN were once / still are redditors. Especially proggit. The type of response where you quote part of the parent, don't add any comment or commentary, isn't especially helpful.
Addressing your second point: I also thought the comment was a snarky reply, wondering why someone would use gzip instead of deflate. The parent comment addressed, specifically, why they were using gzip on PNG, which is why I assumed the 3 character response was focused on the compression type, rather than whether to use it on PNGs.
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Many on HN were once / still are redditors. Especially proggit. The type of response where you quote part of the parent, don't add any comment or commentary, isn't especially helpful.
Addressing your second point: I also thought the comment was a snarky reply, wondering why someone would use gzip instead of deflate. The parent comment addressed, specifically, why they were using gzip on PNG, which is why I assumed the 3 character response was focused on the compression type, rather than whether to use it on PNGs.