Yes and no. It's either an easier to apply, shorter lifespan alternative, in which case it's a replacement. Or a topper for already-coated vehicles, so an additive. As the description says, think of the spray as a sheet of paper, and the small bottle coating as the ream.
In the end, they're both true coatings. So do you want ease of application or longevity? Recommend you watch the video and read the product page for more details.