I think it was probably a combination of (a) the comment wasn't very substantive, and (b) it might seem dismissive to post that in someone's launch thread.
Edit: oh wait. I thought your comment was just "Similar to linear", but you edited it after the fact. Originally it was an entirely different post trying to promote your own product in this space. That's no doubt why DanBC quoted the guideline about promotion. And yes, that was pretty rude to do in someone else's launch thread.
If you have a product that people can try out you might want to submit it as a "ShowHN". Or if you have some detailed technical write ups you could submit those, along with stories from other sources.
The FAQ and guidelines have some useful information.
> A regular "Who Is Hiring?" thread appears on the first weekday of each month (or Jan 2). Most job ads are welcome there. Only an account called whoishiring is allowed to submit the thread itself. This prevents a race to post it first.
Edit: oh wait. I thought your comment was just "Similar to linear", but you edited it after the fact. Originally it was an entirely different post trying to promote your own product in this space. That's no doubt why DanBC quoted the guideline about promotion. And yes, that was pretty rude to do in someone else's launch thread.