[neogodless]

https://en.wikipedia.org/wiki/Advertising "Advertising is a marketing communication that employs an openly sponsored, non-personal message to promote or sell a product, service or idea."

This is a personal message, and not openly sponsored. There is an affiliate link used, which is to say, the blog author likely hopes to make money off his post (even if that's not the primary impetus for his writing.)

As people that use products such as keyboards, I think we're receptive to well-documented personal messages about the products we enjoy using. I don't imagine anyone will get rich off this blog post, and I doubt that was the reason it was written.