Nothing in this image looks engineered. In fact, this is an illustration of a comparatively messy virus particle. Other viruses look a lot more regular and “artificial”. Check out the pictures (including actual SEM pictures) on https://en.wikipedia.org/wiki/Virus. And if that doesn’t convince you, here’s what bacteriophages look like: https://commons.wikimedia.org/wiki/File:Bacteriophage.jpg — Clearly nanobots, right?