A lack of belief among some individuals matters, but not enough to stop a god from being a god. Because, as you say, gods are social constructs. If we consult Merriam Webster and skip the silly monotheist definition, a god is "a being or object that is worshipped as having more than natural attributes and powers". Note that this definition doesn't say the being must actually have these powers. They must only be worshipped as such. The belief is the important thing to the definition, not the truth. This is because divinity is socially constructed. You can't deny a god's divinity except by denying the faith of their followers. If you accept that the worshippers really do believe their god is a god, you must accept that the god is a god. They may well be an undeserving god, or a lying god, or a false god, but a god they still are. If you want to tell Me that Thor isn't a god, I'm going to demand a historical source based on the Eddas, or say you're wrong. Divinity is like a job. If everyone agrees that Mr Smith is a plumber, and His boss pays Him to fix toilets, then Mr Smith is certainly a plumber. It doesn't matter if Mr Smith has never fixed a toilet in His life, society has decided He's a plumber. He could be an incredibly shitty plumber who doesn't know anything about pipes, but He's a plumber.

In fact, let Me go back to the original article and restate its conclusion, because I think you may have been misled by My use of the term "god" to refer to the gods, as you seem to consider "god" a loaded term:

The gods are psychic parasites made out of thoughts who live in the collective consciousness of humanity and really are living beings, capable of taking action as psychic parasites who can affect people's minds. This is not to say the myths are literally true, but rather to say that the myths are alive. That they feed upon worship and command legions of followers from their palaces within our imaginations.