[pahn]

The article is an overview aimed at beginners, but as such actually pretty good and helpful. It does not seem to overtly promote their product. Classifying this as spam / SEO only because one is not the target group is not fair.

[Luc]

The article was obviously written for SEO purposes.

[pahn]

Yes it was, but is it automatically bad because of this? It would be if it would be unhelpful, low-quality or if it would contain deceitful content pushing their product – but I do not see any of this.