You don't need to act like an asshole, let alone when you're factually wrong over something as basic as a simple definition. You might be a good submission for /r/confidentlyincorrect.

Human population growth is exponential.

Growth whose rate becomes ever more rapid in proportion to the growing total number or size.

It's the same with COVID for another example. The more people it infects the greater the rate of infection becomes.

Also, don't link to a blog like it's some kind of valid resource. That's the quickest way to have your argument thrown out. Come back with a more reliable source.