But not written with an intention to market themselves I guess. If merely expressing their true intents works in their favor while not boasting about it, I would not call it marketing.
Nevertheless, it nearly costs $0 to host the site, so even if this is marketing, no spending on it.
Blogging is marketing too, so this statement in particular is not accurate.
In fact, I would say that this very post was quite convincing and a good marketing — and branding — example.
It made me want to know more about this company and “engage” more with it.