It links directly to the Mac App Store which open MAS on my Mac. It's kind of rude. Their web-page does not contain any text describing the product, there is a simple video which could be linked instead. The product is at least 1 year old, judging from comments in the App Store. Usually a Show HN thing is a bit fresher. I agree with OP, this feels less like a Show HN and more like "oh by the way, we should post a Show HN the buy button".