It's good, practical advice, and pointing out how his service provided some real world value (saving money purchasing a generator) wasn't at all contrived.
The title of the article was "Wiring a Generator to Your Home". The crucial part missing from the article was "How to Wire a Generator to Your Home", which he says an electrician should do. Just feels like blog spam to me.
The author goes into a fair amount of detail about the process, but that detail is ultimately useless to most people, because the overriding advice is "Don't try this at home, get an electrician to do it for you"
Their main concern is clearly to plug their product, not to provide useful advice on installing a generator, and the fact that they are exploiting a natural disaster to do so is pretty low.
What's the problem?