I'm the author of the post. I've used this keyboard for half a decade before I decided to write about it.
If you read a few paragraphs of the article you'll see I am using this "generic" keyboard because it's great.
Typing is also a pretty important thing for programmers and I've seen plenty of like/dislike posts about various keyboards. It very much applies to developers.
Actually posting this taught me a pretty good lesson on how hard it is not to be anonymous on the internet. That and I need to drop a 1 liner in the very few posts I have that contain affiliate links.
That said, I'm not sure why anyone is too upset at you for this. From my experience running many sites that use affiliate links, I can't imagine you're making any significant income from the affiliate links anyway, not to mention that's obviously not the purpose of this article.