Point is that if they're selling a product, they could make it more clear what the thing they're selling is. I'm EXACTLY the target market, and they failed to entice me.
You're not the target market if you couldn't figure out what they are. I've never heard of it but one look at the screenshot told me exactly what it is.
The target market are developers who are in need of a very specific solution that postman provides. How do you think most postman users end up at the site? They probably search for some very specific keywords on google, asked some very specific question on stackoverflow, or got referred to it by reading some very specific article on reddit/hn/etc. They aren't people with 2 second attention spans who can't be bothered to read beyond the tag line.
smlacy's response felt pretty much like trolling to me.